Answer:
0.48
Step-by-step explanation:
Probability that the first person chooses a hotel
⁵C₁
[tex]^5C_1=\frac{5!}{(5-1)!1!}\\=\frac{120}{24}=5[/tex]
Probability that the second person chooses a different hotel
⁴C₁
[tex]^4C_1=\frac{4!}{(4-1)!1!}\\=\frac{24}{6}=4[/tex]
because the choice of hotels has reduced by 1 as one hotel is occupied by the first person
Probability that the second person chooses a different hotel
³C₁
[tex]^3C_1=\frac{3!}{(3-1)!1!}\\=\frac{6}{2}=3[/tex]
because the choice of hotels has reduced by 2 as two different hotels are occupied by the first person and second person
∴ The favorable outcomes are =⁵C₁×⁴C₁׳C₁=5×4×3=60
The total number of outcomes=5³=125
∴Probability that they each check into a different hotel=60/125=0.48
9. If you have twice as many pennies as nickels, and the total value of these coins is the same as the value of 32 quarters, how many pennies do you have?
Answer:
The answers is 228 pennies.
Step-by-step explanation:
The values of the subunits of a dollar are:
1 penny = $0.01.
1 nickel = $0.05.
1 quarter = $0.25.
If all the pennies and nickels that you have are equal to 32 quarters:
32*$0.25=$8Now, we have twice pennies as many nickels, and x is the total amount of coins:
2x * $0.1 + $0.05x = $8Multiply and add the terms of the equation:
$0.02x + $0.05x = $8$0.07x = $8Divide by $0.07 in both terms of the equation:
x = $8/$0.07x ≅ 114 because you can have a half penny nor nickel.When x = 114 means that you have 114 nickels and 228 pennies.
Replacing x=114
$0.02*114 + $0.05*114 = $8Every cereal box has a gift inside, but you cannot tell from the outside what the gift is. The store manager assures you that 11 of the 54 boxes on the shelf have the secret decoder ring. The other 43 boxes on the shelf have a different gift inside. If you randomly select two boxes of cereal from the shelf to purchase, what is the probability that BOTH of them have the secret decoder ring?
Answer:
The probability that BOTH of them have the secret decoder ring is [tex]\frac{55}{1431}[/tex].
Step-by-step explanation:
From the given information it is clear that the total number of boxes is 54.
Total number of boxes that have the secret decoder ring = 11
Total number of boxes that have a different gift inside = 43
Total number of ways to select 2 boxes from the boxes that have the secret decoder ring is
[tex]\text{Favorable outcomes}=^{11}C_2=\frac{11!}{2!(11-2)!}=\frac{11\times 10\times 9!}{2!9!}=55[/tex]
Total number of ways to select 2 boxes from the total number of boxes is
[tex]\text{Total outcomes}=^{54}C_2=\frac{52!}{2!(52-2)!}=\frac{52\times 51\times 50!}{2!50!}=1431[/tex]
The probability that BOTH of them have the secret decoder ring is
[tex]P=\frac{\text{Favorable outcomes}}{\text{Total outcomes}}[/tex]
[tex]P=\frac{55}{1431}[/tex]
Therefore the probability that BOTH of them have the secret decoder ring is [tex]\frac{55}{1431}[/tex].
Probability = 5/131, which is the final answer.
To calculate the probability that both boxes contain the secret decoder ring, we need to consider that the boxes are selected one after the other without replacement. Since there are 11 boxes with secret decoder rings out of 54, the probability of picking a secret decoder ring on the first try is 11/54. If a secret decoder box is picked first, there will be 10 secret decoder rings left out of the remaining 53 boxes. So the probability of picking another secret decoder ring is 10/53.
The overall probability of both events happening is the product of the two probabilities because we need both events to occur. Therefore, we multiply the separate probabilities together:
Probability = (11/54) imes (10/53)
When we calculate this, we get:
Probability = 110/2862
This fraction can be simplified to:
Probability = 5/131, which is the final answer.
Using the simple random sample of weights of women from a data set, we obtain these sample statistics: nequals45 and x overbarequals148.79 lb. Research from other sources suggests that the population of weights of women has a standard deviation given by sigmaequals31.37 lb. a. Find the best point estimate of the mean weight of all women. b. Find a 90% confidence interval estimate of the mean weight of all women.
Answer: (141.1, 156.48)
Step-by-step explanation:
Given sample statistics : [tex]n=45[/tex]
[tex]\overline{x}=148.79\text{ lb}[/tex]
[tex]\sigma=31.37\text{ lb}[/tex]
a) We know that the best point estimate of the population mean is the sample mean.
Therefore, the best point estimate of the mean weight of all women = [tex]\mu=148.79\text{ lb}[/tex]
b) The confidence interval for the population mean is given by :-
[tex]\mu\ \pm E[/tex], where E is the margin of error.
Formula for Margin of error :-
[tex]z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}[/tex]
Given : Significance level : [tex]\alpha=1-0.90=0.1[/tex]
Critical value : [tex]z_{\alpha/2}=z_{0.05}=\pm1.645[/tex]
Margin of error : [tex]E=1.645\times\dfrac{31.37}{\sqrt{45}}\approx 7.69[/tex]
Now, the 90% confidence interval for the population mean will be :-
[tex]148.79\ \pm\ 7.69 =(148.79-7.69\ ,\ 148.79+7.69)=(141.1,\ 156.48)[/tex]
Hence, the 90% confidence interval estimate of the mean weight of all women= (141.1, 156.48)
Given P(A) = 0.37, P(B) 0.38, and P(A or B) 0.27, are events A and B mutually exclusive? Yes, they are mutually exclusive No, they are not mutually exclusive
Answer:
No, they are not mutually exclusive.
Step-by-step explanation:
Two events are called mutually exclusive they are independent to each other.
Also, If A and B are any two events,
Then they are called mutually exclusive,
If P(A ∪ B ) = P(A) + P(B)
Or P ( A or B ) = P(A) + P(B)
Here, P(A) = 0.37, P(B) = 0.38 and P(A or B) = 0.27
Since,
0.27 ≠ 0.37 + 0.38
⇒ P ( A or B ) ≠ P(A) + P(B)
Hence, A and B are not mutually exclusive.
A coin is tossed 5 times. Find the probability that exactly 1 is a tail. Find the probability that at most 2 are tails.
Answer:
Step-by-step explanation:
First questionThe only possibilities where there is exactly 1 tail are:
(t,h,h,h,h)(h,t,h,h,h)(h,h,t,h,h)(h,h,h,t,h)(h,h,h,h,t)those are 5 favorable outcomes.
where h represent heads and t represent tails. There are [tex]2^5 32[/tex] total number of outcomes after tossing the coin 5 times. Because every time you toss the coin, you have 2 possibilities, and as you do it 5 times, those are [tex]2^5[/tex] options. We can conclude from this that
The probability that exactly 1 is a tail is [tex]5/32[/tex].
Second questionWe already know the total number of outcomes; 32. Now we need to find the number of favorable outcomes. In order to do that, we can divide our search in three cases: 1.-there are no tails, 2.-exactly 1 is a tail, 3.- exactly 2 are tails.
The first case is 1 when every coin is a head. The second case we already solved it, and there are 5. The third case is the interesting one, we can count the outcomes as we did in the previous questions, but that's only because there are not too many outcomes. Instead we are going to use combinations:
We need to have 2 tails, the other coins are going to be heads. We made 5 tosses, then the possible combinations are [tex]C_{5,2} = \frac{5!}{3!2!} = \frac{120}{6*2} = 10[/tex]
Finally, we conclude that there are 1 + 5 + 10 favorable outcomes, and this implies that
The probability that at most 2 are tails is [tex]\frac{16}{32} = \frac{1}{2}[/tex].
In a five-coin toss, the probability of getting exactly one tail is 5/32 and the probability of getting at most two tails is 0.5. These probabilities are calculated considering all possible outcomes and arranging the heads and tails in distinct manners.
Explanation:The question you've asked involves calculating the probabilities in coin flipping, a common concept in mathematics and particularly in statistics. This falls under the topic of probability theory.
When a fair coin is tossed 5 times, there are 2^5 or 32 equally likely outcomes. If we want exactly 1 tail, there are 5 ways this can happen (one for each position the tails can be in). Thus, the probability for this occurrence is 5/32.
To find out the probability of getting at most 2 tails, we need to calculate the probability for getting exactly 0, 1, or 2 tails. As we already know that the probability for 1 tail is 5/32 and for 0 tails is 1/32 (only 1 way to get this outcome, getting heads every time). The probability for exactly 2 tails can be found in the same manner as for 1 tail, now we have 2 tails and it can be arranged in 5C2 ways which is 10 ways. Therefore, the probability of 2 tails is 10/32. Hence, the probability of getting at most 2 tails is the sum of probabilities of 0,1 or 2 tails, which is (1 + 5 + 10 )/32 = 16/32 = 0.5.
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uestion 2 The points A(-2, 3,-1), B(0, 5, 2) and C(-1, -2, 1) lies on the same plane. (a) Find the vector equation of the plane. (b) Find the Cartesian of the plane
Answer with explanation:
Equation of Plane having Direction cosines A, B and C passing through points, p, q and r is
⇒A (x-p)+B(y-q)+C(z-r)=0
The plane passes through the points A(-2, 3,-1), B(0, 5, 2) and C(-1, -2, 1).
→A(x+2)+B(y-3)+C(z+1)=0----------(1)
→A(0+2)+B(5-3)+C(2+1)=0
2 A +2 B+3 C=0
→A(-1+2)+B(-2-3)+C(1+1)=0
A -5 B+2 C=0
[tex]\Rightarrow \frac{A}{4+15}=\frac{B}{3-4}=\frac{C}{-10-2}\\\\\Rightarrow \frac{A}{19}=\frac{B}{-1}=\frac{C}{-12}=k\\\\A=19 K,B=-K, C=-12K[/tex]
Substituting the value of A , B and C in equation (1)
⇒19 K(x+2)-K(y-3)-12 K(z+1)=0
⇒19 x +38 -y +3-12 z-12=0
⇒19 x -y -12 z +29=0, is the required equation of Plane in Cartesian form.
⇒(19 i -j -12 k)(xi +y j+z k)+29=0 ,is the required vector equation of the plane.
The absolute value of any real number is
A. Nonnegative
B. Negative
C. Irrational
D. Zero
Answer:
A. Nonnegative
Step-by-step explanation:
By definition, the absolute value of any number must be positive (i.e non-negative).Hence A is the answer.
2^30 + 2^30 + 2^30 + 2^30 =
a) 8^120 b) 8^30 c) 8^32 d) 2^32 e) 2^30
Answer:
D
Step-by-step explanation:
[tex]x+x+x+x=4 \cdot x \text{ or } 4x[/tex]
So [tex]2^{30}+2^{30}+2^{30}+2^{30}=4 \cdot 2^{30}[/tex].
Now 4 can be rewritten so that it is 2 to some power.
4 is actually 2 to the second.
That is, [tex]4=2^2[/tex].
So [tex]2^{30}+2^{30}+2^{30}+2^{30}=2^2 \cdot 2^{30}[/tex].
Now there is a law of exponents that says if the bases are the same and your multiplying add the exponents.
[tex]2^{30}+2^{30}+2^{30}+2^{30}=2^2 \cdot 2^{30}[/tex].
[tex]2^{30}+2^{30}+2^{30}+2^{30}=2^{32}[/tex].
Answer:
The answer is D! Hope this helped.
Step-by-step explanation:
7. What is the cardinality of each of the following sets?
a) { }
b) { { } }
c) {a, {a}, {a, {a}} }
NOTE: I need the answer type out NOT hand written, the last person to answer this question teriibly hand wrote the answer and I could not read it.
Answer:
The cardinality of set (a) is 0,
the cardinality of set (b) is 1
and
the cardinality of set (c) is 3.
Step-by-step explanation: We are given to find the cardinality of each of the following sets :
(a) { }.
(b) { { } }.
(c) {a, {a}, {a, {a}} }.
We know that
CARDINALITY of a set is the number of elements present in the set.
(a) The given set is A = { }.
The set A is an empty set, so it does not contain any element. Hence, the cardinality of the set A is 0.
(b) The given set is B = { { } }.
The set is B is singleton set, contains only one element (that is empty set). So, the cardinality of the set B is 1.
(c) The given set is C = {a, {a}, {a, {a}} }.
The set C has three elements, a, the set {a} and the set {a, {a}}. So, the the cardinality of set C is 3.
Thus,
the cardinality of set (a) is 0,
the cardinality of set (b) is 1
and
the cardinality of set (c) is 3.
Imagine that 30% of all U.S. Households own a dog, P(A)=.3 and that 10% of U.S. households own a Honda vehicle, P(B)=.1. In addition, you know that 60% of dog owners own a Honda, P(A|B)=.6. What is the probability of a household owning a Honda given that they are a dog owner?
Math help ASAP!! Picture with problem included
Answer:
0.85 M + 22.55
Step-by-step explanation:
We know that the total cost is the standard cost plus the insurance cost
C(M) = S(M) + I(M)
= 17.75 + .60M + 4.80+.25M
Combine like terms
= 0.85 M + 22.55
For this case we have that the standard charge, in dollars, of a company that rents vehicles is given by:
[tex]S = 17.75 + 0.60M[/tex]
M: Number of miles traveled.
On the other hand, the insurance charge is given by:
[tex]I = 4.80 + 0.25M[/tex]
If we want to find the total cost of renting the vehicle, we must add both equations:
[tex]C = 17.75 + 0.60M + 4.80 + 0.25M[/tex]
We add similar terms:
[tex]C = 17.75 + 4.80 + 0.60M + 0.25M\\C = 22.55 + 0.85M[/tex]
Answer:
[tex]C = 22.55 + 0.85M[/tex]
If (x,y) is a solution to the system of equations shown below, what is the product of the y-coordinates of the solutions? x^2+y^2=9 x+y=3
Answer:
The product of the y-coordinates of the solutions is equal to zero
Step-by-step explanation:
we have
[tex]x^{2}+y^{2}=9[/tex] -----> equation A
[tex]x+y=3[/tex] ------> equation B
Solve by graphing
Remember that the solutions of the system of equations are the intersection point both graphs
using a graphing tool
The solutions are the points (0,3) and (3,0)
see the attached figure
The y-coordinates of the solutions are 3 and 0
therefore
The product of the y-coordinates of the solutions is equal to
(3)(0)=0
The steps to solve the system of equations involve isolating x in one equation and substituting into the other. Solving yields two solutions for y, y = 0 and y = 3. Their product is 0.
Explanation:The system of equations given are [tex]x^2+y^2=9[/tex] and x+y=3. From the second equation, we can isolate x as x = 3 - y and substitute into the first equation, yielding: [tex](3 - y)^2 + y^2 = 9[/tex]. This simplifies to [tex]2y^2 - 6y + 9 = 9,[/tex]and then to [tex]2y^2 - 6y = 0[/tex]. If we factor y from this equation, we get y(2y - 6) = 0, giving two possible solutions for y: y = 0, and y = 3. As asked, the product of these y-coordinates is 0 * 3 = 0.
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Shawn is interested in purchasing a new computer system for $1,650.00 and would like to apply a down payment of 20%. Calculate the down payment amount. Round dollars to the nearest cent.
Answer: Down payment amount = $330
Step-by-step explanation:
Given in the question that Shawn is interested in purchasing a new computer system and he wants to to give a 20% down payment.
Cost of Computer system = $1650
He would like to made a 20% down payment
So, the down payment amount is as follows:
20% of $1650 = [tex]\frac{20}{100}[/tex] × 1650
= $ 330 ⇒ Down payment amount
John a US citizen, is a product manager who moved to Argentina to work at the South American office of Ridmore Corporation, arn American compary Based on this information, John is an)
A) expatriate manger
B) third-country manager
C)inpatriate manager
D) polycentric manager
E) virtual manager
Answer:
The correct answer is A. Being American but working in Argentina, John is an expatriate manager.
Step-by-step explanation:
An expatriate is a person who, temporarily or permanently, resides in a country different from the country in which he was born. The term is commonly used in the case where companies send their professionals or workers to their delegations abroad.
Prove that if a is equivalent to 5 mod (8) and b is equivalent to 3 mod (8), then 8 divides ab+1
Answer:
Explanation contains the proof.
Step-by-step explanation:
[tex]a \equiv 5 (mod 8) \text{ means there is integer } k \text{ such that } a-5=8k[/tex].
[tex]b \eqiv 3 (mod 8) \text{ means there is integer } m \text{ such that } b-3=8m[/tex].
We want to show that [tex]8 \text{ divides } ab+1[/tex]. So we are asked to show that there exist integer [tex]n \text{ such that } 8n=ab+1 \text{ or 8n-1=ab[/tex]
So what is [tex]ab[/tex]?
[tex]a-5=8k \text{ gives us } a=8k+5[/tex].
[tex]b-5=8m \text{ gives us } b=8m+5[/tex].
So back to [tex]ab[/tex]....
[tex]ab[/tex]
[tex]=(8k+5)(8m+5)[/tex]
[tex]=64km+40k+40m+25[/tex] (I use foil to get this)
Factoring out 8 gives us:
[tex]=8(8km+5k+5m)+25[/tex]
Now I could have factored some 8's out of 25. There are actually three 8's in 25 with a remainder of 1.
[tex]=8(8km+5k+5m+3)+1[/tex]
We have shown that there is integer [tex]n \text{ such that } ab=8n-1[/tex].
The integer I found that is n is 8km+5k+5m+3.
Therefore [tex]8|(ab+1)[/tex].
//
Answer:
See below.
Step-by-step explanation:
If a = 5 mod 8 and b = 3 mod 8
then ab = 5*3 mod 8 = 15 mod 8 = 7 mod 8.
ab + 1 = 8 mod 8 = 0 mod 8 so it is divisible by 8.
In a survey conducted by Helena, a financial consultant, it was revealed of her 426 clients
288 own stocks.
200 own bonds.
184 own mutual funds.
123 own both stocks and bonds.
106 own both stocks and mutual funds.
102 own both bonds and mutual funds.
How many of Helena's clients own stocks, bonds, and mutual funds? (Assume each client invested in at least one of the three types of funds.)
_______clients
Answer: There are 85 Helena's client own stocks, bonds and mutual funds.
Step-by-step explanation:
Since we have given that
Let A: who own stocks
B : who own bonds
C : who own mutual fund
So, According to question,
n(A) = 288
n(B) = 200
n(C) = 184
n(A∩B) = 123
n(B∩C) = 106
n( A∩C) = 102
n(A∪B∪C) = 426
As we know the formula :
[tex]n(A\cup B\cup C)=n(A)+n(B)+n(C)-n(A\cap B)-n(B\cap C)-n(A\cap C)+n(A\cap B\cap C)\\\\426=288+200+184-123-106-102+n(A\cap B\cap C)\\\\426-341=n(A\cap B\cap C)\\\\85=n(A\cap B\cap C)[/tex]
Hence, there are 85 Helena's client own stocks, bonds and mutual funds.
To determine the number of clients who own stocks, bonds, and mutual funds, we can use the principle of inclusion-exclusion. This principle allows us to properly account for overlap in the sets of clients for different investment types.
We were told the following:
- The total number of clients is 426.
- The number of clients who own stocks is 288.
- The number of clients who own bonds is 200.
- The number of clients who own mutual funds is 184.
- The number of clients who own both stocks and bonds is 123.
- The number of clients who own both stocks and mutual funds is 106.
- The number of clients who own both bonds and mutual funds is 102.
Now, when we sum up the number of clients who own stocks, bonds, and mutual funds individually, we're double-counting those clients who have investments in more than one of these. We need to subtract the clients who are counted twice.
So, let's add up all the individuals:
S + B + M = 288 + 200 + 184 = 672
Now, let's subtract the number of clients who were double-counted:
(S + B + M) - (SB + SM + BM) = 672 - (123 + 106 + 102) = 672 - 331 = 341
However, in this calculation, we've subtracted clients who own all three: stocks, bonds, and mutual funds, three times (once for each pair), and then added them back in only once, so we've subtracted them two times too many.
Therefore, we need to correct for this: to find the number of people who own all three, we add the total number of clients (since everyone owns at least one of the three) and then subtract the sum we have just calculated.
Total + All three (overcorrected) = Total clients
426 + All three (overcorrected) = 341
To solve for the overcorrection (the actual number of clients who own all three types), we can now rearrange the equation:
All three (overcorrected) = 341 - 426
All three (overcorrected) = -85
However, since the number of people cannot be negative, this outcome indicates a logical inconsistency. Such an inconsistency generally means there must have been a mistake in either the data provided or the calculations based on that data. Under normal circumstances, you would go back and verify the numbers. But given this answer, it would suggest that the data provided has some inconsistencies, and it is not possible for a negative number of clients to own all three funds.
Which of the following is NOT a conclusion of the Central Limit Theorem? Choose the correct answer below. A. The mean of all sample means is the population mean mu. B. The standard deviation of all sample means is the population standard deviation divided by the square root of the sample size. C. The distribution of the sample data will approach a normal distribution as the sample size increases. D. The distribution of the sample means x overbar will, as the sample size increases, approach a normal distribution.
Answer:
The distribution of the sample data will approach a normal distribution as the sample size increases.
Step-by-step explanation:
Central limit theorem states that the mean of all samples from the same population will be almost equal to the mean of the population, if the large sample size from a population, is given with a finite level of variance.
So, here Option C is not correct conclusion of central limit theorem -The distribution of the sample data will approach a normal distribution as the sample size increases.
We can say that the average of sample mean tends to be normal but not the sample data.
The option that's is not a conclusion of the Central Limit Theorem is C. The distribution of the sample data will approach a normal distribution as the sample size increases.
According to the central limit theorem, the standard deviation of all sample means will be the population standard deviation divided by the square root of the sample size.
Also, the mean of all sample means is the population mean is equal to the mean of the population.
It should be noted that the distribution of the sample data will not approach a normal distribution as the sample size increases.
In conclusion, the correct option is C.
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Use Simpson's Rule with n = 10 to approximate the area of the surface obtained by rotating the curve about the x-axis. Compare your answer with the value of the integral produced by a calculator. (Round your answers to the nearest whole number.) y = 1 5 x5, 0 ≤ x ≤ 5
[tex]\[ \int_{0}^{5} \frac{1}{5} x^5 \, dx \approx 520.8333 \][/tex]
Given:.A single card is randomly drawn from a deck of 52 cards. a, Find the probability that it is an ace. b. Find the probability that it is a number less than 5 (not including the ace).
Answer:
P( ace) = 1/13
P (< 5) = 3/13
Step-by-step explanation:
There are 4 Aces in a deck of cards, 1 in each suit
P (ace) = number of aces/ total cards
= 4/52 = 1/13
Numbers less than 5: 4 twos, 4 threes, 4 fours =12 cards less than 5 ( since we do not include aces) There are 4 of each card since there is one in each suit.
P ( card < 5) = cards less than 5/ total
=12/52 = 3/13
Answer:
A: 1/13 B: 3/13
Step-by-step explanation:
There are 4 aces in a deck. 4/52=1/13
If you are talking about 2,3,4 then 12/52=3/13
If you include the 5 it is 16/64= 4/13
A thief steals an ATM card and must randomly guess the correct three-digit pin code from a 8-key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?
Answer:
[tex] \frac{1}{ {8}^{3} } [/tex]
A food processor packages orange juice in small jars. The weights of the filled jars are approximately normally distributed with a mean of 10.5 ounces and a standard deviation of 0.3 ounce. Find the proportion of all jars packaged by this process that have weights that fall above10.95 ounces.
Answer:
6.68 %.
Step-by-step explanation:
The standardised z-score = ( 10.95 - 10.5) / 0.3
= 1.5.
Looking up the Normal Distribution tables ( area to the left) 1.5 corresponds to 0.93319 so for a weight above 10.95 the proportion is
1 - 0.93319 = 0.06681
= 6.68%.
We can use the z-score to find the proportion of jars that are above a certain weight in a normal distribution. The z-score for 10.95 ounces is 1.5. Using a standard normal distribution table, we find that about 6.68% of the jars weigh more than 10.95 ounces.
Explanation:In this problem, we are using the concept of normal distribution, specifically to find the proportion of jars that are above a certain weight. Given that the mean (average) weight of the jars is 10.5 ounces and the standard deviation (which measures the dispersion of the weights) is 0.3 ounce, we can calculate the z-score for 10.95 ounces.
The z-score is defined as the number of standard deviations a data point is from the mean. Compute it using the formula: Z = (X - μ) / σ where X is the value, μ is the mean and σ is the standard deviation.
Plugging into the formula we get: Z = (10.95 - 10.5) / 0.3 = 1.5
You can then look up this z-score in a standard normal distribution table (or use a calculator or computer software that calculates it), to find the proportion below this z-score. But we need the proportion above, so we subtract this from 1. Let's say the value from a z-table for 1.5 is 0.9332, the proportion of values above this would be 1 - 0.9332 = 0.0668 or about 6.68% of the jars weigh more than 10.95 ounces.
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If a distribution of test scores is normal with a mean of 78 and a standard deviation of 11, calculate the z-score for the following scores X Z-score 60 70 80 90 60 65 70 80 99 89 75 Make sure to round up your answers to two digits after the decimal point.
To calculate the z-score, subtract the mean from the score and divide by the standard deviation. The calculated z-scores for the given test scores are -1.64, -0.73, 0.18, 1.09, -1.64, -1.18, -0.73, 0.18, 1.91, 1.00, and -0.27.
Explanation:The z-score is a standardized value that measures how many standard deviations a score is above or below the mean. To calculate the z-score, we use the formula z = (X - µ) / σ, where X is the score, µ is the mean, and σ is the standard deviation.
For the score 60, the z-score is (60 - 78) / 11 = -1.64.For the score 70, the z-score is (70 - 78) / 11 = -0.73.For the score 80, the z-score is (80 - 78) / 11 = 0.18.For the score 90, the z-score is (90 - 78) / 11 = 1.09.For the score 60, the z-score is (60 - 78) / 11 = -1.64.For the score 65, the z-score is (65 - 78) / 11 = -1.18.For the score 70, the z-score is (70 - 78) / 11 = -0.73.For the score 80, the z-score is (80 - 78) / 11 = 0.18.For the score 99, the z-score is (99 - 78) / 11 = 1.91.For the score 89, the z-score is (89 - 78) / 11 = 1.00.For the score 75, the z-score is (75 - 78) / 11 = -0.27.Simplify the following. (a) 3(-3 + 5x) - 1 (4 - 4x) (b) 3 squareroot 64 x^15 y^3 -2(-15 e^5 t/30 e^-2 t^-3)^0
Answer:
a. 19x-13 b. [tex]2(32x^{15}y^{3}-1).[/tex]
Step-by-step explanation:
a. 3(-3+5x)-1(4-4x) = -9+15x-4+4x = 15x+4x-9-4 = 19x-13.
b. [tex]64x^{15}y^{3}-2(-15e^{5}\frac{t}{30}e^{-2}t^{-3})^{0}[/tex]
= [tex]64x^{15}y^{3}-2 = 2(32x^{15}y^{3}-1).[/tex]
Which of the following is true regarding the PTIN? A. A PTIN is required to prepare or sign most tax returns. B A PTIN is required to represent a taxpayer before IRS. C. The PTIN is renewed semi-annually. D. Your PTIN can be shared with other members of a firm
Answer:
The first option is the correct answer.
Step-by-step explanation:
A PTIN is required to prepare or sign most tax returns.
The PTIN or full form Preparer Tax Identification Number (PTIN) is an identification number, used by the pre parers to claim for refund or compensation during tax return filing.
So, a person who has to claim refund must have his or her own PTIN and each tax return pre parer may only obtain one PTIN.
If the costs (S and H) and demands (D) are the same, which of the following is not true with regard to the EPQ model as compared to the EOQ model?
a) the EPQ model produces a lower annual cost
b) the maximum inventory level is lower under the EPQ model than under the EOQ model
c) both models use the same formula to compute annual ordering cost
d) the inventory depletion rate is not the same for both models
e) the two models use different formulas to compute annual holding costs
Final answer:
The EPQ model differs from the EOQ model in terms of annual cost, maximum inventory level, inventory depletion rate, and formulas for computing holding costs.
Explanation:
In the EPQ (Economic Production Quantity) model, the costs and demands are assumed to be the same. Compared to the EOQ (Economic Order Quantity) model, there are a few differences:
The EPQ model does not necessarily produce a lower annual cost. It may or may not, depending on the specific parameters and assumptions.The maximum inventory level is typically higher under the EPQ model than under the EOQ model.Both models use the same formula to compute annual ordering cost.The inventory depletion rate is not the same for both models. In the EPQ model, the rate at which inventory is used depends on the production rate, whereas the EOQ model assumes a constant rate of usage.The two models use different formulas to compute annual holding costs. The EPQ model considers holding cost as a percentage of average inventory, while the EOQ model considers holding cost as a function of order quantity and holding cost per unit.Find a power series representation for f(x) = 1 (10 + x)2 . f(x) = ∞ n = 0 What is the radius of convergence, R? R = (b) Use part (a) to find a power series representation for f(x) = x3 (10 + x)2 . f(x) = ∞ n = 0 What is the radius of convergence, R?
a. The power series representation for [tex]\( f(x) = \frac{1}{(10 + x)^2} \)[/tex] is:
[tex]f(x) = \sum_{n=0}^{\infty} (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n[/tex]
with a radius of convergence of 10.
b. The power series representation for [tex]\( f(x) = \frac{1}{(10 + x)^3} \)[/tex] is:
[tex]f(x) = \sum_{m=0}^{\infty} (m + 2)(m + 1) \left(-\frac{1}{10}\right)^{m+2} x^m[/tex]
with a radius of convergence of 10.
Question a:
To find a power series representation for the function [tex]\( f(x) = \frac{1}{(10 + x)^2} \)[/tex].
The sum of an infinite geometric series is given by:
[tex]\frac{1}{1 - r} = \sum_{n=0}^{\infty} r^n[/tex]
where [tex]\( |r| < 1 \)[/tex] for convergence.
First, let's consider the function [tex]\( g(x) = \frac{1}{10 + x} \)[/tex]. Its power series can be found by rewriting it in a form similar to the geometric series:
The geometric series with [tex]\( r = -\frac{x}{10} \)[/tex]. Thus, its power series is:
[tex]g(x) = \frac{1}{10} \sum_{n=0}^{\infty} \left(-\frac{x}{10}\right)^n[/tex]
To find the power series for [tex]\( f(x) = \frac{1}{(10 + x)^2} \)[/tex], we can differentiate [tex]\( g(x) \)[/tex] term by term, as the derivative of [tex]\( g(x) \) is \( f(x) \)[/tex]. The derivative of [tex]\( g(x) \)[/tex] is:
[tex]g'(x) = \frac{1}{10} \sum_{n=0}^{\infty} n \left(-\frac{1}{10}\right)^n x^{n-1}[/tex]
Since [tex]\( g'(x) = f(x) \)[/tex], we have:
[tex]f(x) = \frac{1}{10} \sum_{n=0}^{\infty} n \left(-\frac{1}{10}\right)^n x^{n-1}[/tex]
Adjust the index and powers to start the series from [tex]\( n = 0 \)[/tex]. Let's change the index by setting [tex]\( m = n - 1 \)[/tex], so [tex]\( n = m + 1 \)[/tex].
Since the series actually starts from [tex]\( m = 0 \) (equivalent to \( n = 1 \))[/tex], we can rewrite it as:
[tex]$$f(x) = \sum_{m=0}^{\infty} (m + 1) \left(-\frac{1}{10}\right)^{m+1} x^m$$[/tex]
For the radius of convergence, [tex]\( R \)[/tex], we can use the ratio test. The ratio test states that for a series [tex]\( \sum a_n \)[/tex], if [tex]\( \lim_{n \to \infty} \left| \frac{a_{n+1}}{a_n} \right| = L \)[/tex], then the series converges if [tex]\( L < 1 \)[/tex]. The terms of our series are [tex]\( a_n = (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n \)[/tex].
The terms of our series are [tex]\( a_n = (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n \)[/tex]. Applying the ratio test:
[tex]\lim_{n \to \infty} \left| \frac{(n + 2)}{(n + 1)} \cdot \left(-\frac{1}{10}\right) \cdot x \right|[/tex]
As [tex]\( n \)[/tex] approaches infinity, the term [tex]\( \frac{(n + 2)}{(n + 1)} \)[/tex] approaches 1, so the limit simplifies to:
[tex]\lim_{n \to \infty} \left| -\frac{x}{10} \right| = \frac{|x|}{10}[/tex]
For the series to converge, this limit must be less than 1:
[tex]\frac{|x|}{10} < 1[/tex]
[tex]|x| < 10[/tex]
Thus, the radius of convergence, [tex]\( R \)[/tex], is 10.
Power series representation for [tex]\( f(x) = \frac{1}{(10 + x)^2} \)[/tex] is:
[tex]f(x) = \sum_{n=0}^{\infty} (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n[/tex]
Question b:
To find a power series representation for [tex]\( f(x) = \frac{1}{(10 + x)^3} \)[/tex], we can use the result from part (a), where we found a power series for [tex]\( \frac{1}{(10 + x)^2} \)[/tex], and differentiate it once more.
From part (a), we have:
[tex]\frac{1}{(10 + x)^2} = \sum_{n=0}^{\infty} (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n[/tex]
To find the power series for [tex]\( f(x) = \frac{1}{(10 + x)^3} \)[/tex], we differentiate the series for [tex]\( \frac{1}{(10 + x)^2} \)[/tex] term by term.
The derivative of [tex]\( (n + 1) \left(-\frac{1}{10}\right)^{n+1} x^n \)[/tex] with respect to [tex]\( x \)[/tex] is:
[tex](n + 1) n \left(-\frac{1}{10}\right)^{n+1} x^{n-1}[/tex]
power series for [tex]\( f(x) \)[/tex] is:
[tex]f(x) = \sum_{n=0}^{\infty} (n + 1) n \left(-\frac{1}{10}\right)^{n+1} x^{n-1}[/tex]
Change the index by setting [tex]\( m = n - 1 \)[/tex], so [tex]\( n = m + 1 \)[/tex]. Then, our series becomes:
[tex]f(x) = \sum_{m=-1}^{\infty} (m + 2)(m + 1) \left(-\frac{1}{10}\right)^{m+2} x^m[/tex]
Since the series actually starts from [tex]\( m = 0 \)[/tex] (equivalent to [tex]\( n = 1 \))[/tex], we can rewrite it as:
[tex]f(x) = \sum_{m=0}^{\infty} (m + 2)(m + 1) \left(-\frac{1}{10}\right)^{m+2} x^m[/tex]
For the radius of convergence, [tex]\( R \)[/tex], we can use the same approach as in part (a).
Applying the ratio test:
[tex]\lim_{m \to \infty} \left| \frac{(m + 3)}{(m + 1)} \cdot \left(-\frac{1}{10}\right) \cdot x \right|[/tex]
As [tex]\( m \)[/tex] approaches infinity, the term [tex]\( \frac{(m + 3)}{(m + 1)} \)[/tex] approaches 1, so the limit simplifies to:
[tex]\lim_{m \to \infty} \left| -\frac{x}{10} \right| = \frac{|x|}{10}[/tex]
For the series to converge, this limit must be less than 1:
[tex]\frac{|x|}{10} < 1[/tex]
[tex]|x| < 10[/tex]
Power series representation for [tex]\( f(x) = \frac{1}{(10 + x)^3} \)[/tex] is:
[tex]f(x) = \sum_{m=0}^{\infty} (m + 2)(m + 1) \left(-\frac{1}{10}\right)^{m+2} x^m[/tex]
The most popular mathematician in the world is throwing aparty for all of his friends. As a way to kick things off, they decidethat everyone should shake hands. Assuming all 10 people atthe party each shake hands with every other person (but notthemselves, obviously) exactly once, how many handshakes takeplace?
Answer:
The no. of possible handshakes takes place are 45.
Step-by-step explanation:
Given : There are 10 people in the party .
To Find: Assuming all 10 people at the party each shake hands with every other person (but not themselves, obviously) exactly once, how many handshakes take place?
Solution:
We are given that there are 10 people in the party
No. of people involved in one handshake = 2
To find the no. of possible handshakes between 10 people we will use combination over here
Formula : [tex]^nC_r=\frac{n!}{r!(n-r)!}[/tex]
n = 10
r= 2
Substitute the values in the formula
[tex]^{10}C_{2}=\frac{10!}{2!(10-2)!}[/tex]
[tex]^{10}C_{2}=\frac{10!}{2!(8)!}[/tex]
[tex]^{10}C_{2}=\frac{10 \times 9 \times 8!}{2!(8)!}[/tex]
[tex]^{10}C_{2}=\frac{10 \times 9 }{2 \times 1}[/tex]
[tex]^{10}C_{2}=45[/tex]
No. of possible handshakes are 45
Hence The no. of possible handshakes takes place are 45.
A box is being pulled by two people. The ropes make angles of 40° and 55° with the direction of motion of the box. If the resultant force is 700 N, find the force that each ropes exerts on the box.
Answer:
575.6 N at 40°451.7 N at 55°Step-by-step explanation:
Angles are measured from the direction of motion, so the "force made good" is the force in the rope multiplied by the cosine of the angle. If the forces in the ropes (in Newtons) are represented by x and y, then we have ...
x·cos(40°) +y·cos(55°) = 700
In order for the resultant to be in the direction of motion, the forces perpendicular to the direction of motion must cancel.
x·sin(40°) - y·sin(55°) = 0
Here, we have assumed that the positive direction for measuring 40° is the negative direction for measuring 55°. That is, the angles are measured in opposite directions from the direction of motion.
Any of the usual methods for solving systems of linear equations can be used to solve this set. My preference is to use a graphing calculator. It gives the answers summarized above.
Type in only your numerical answer to the following problem; do not type any words or letters with your answer. The population of Neverland was 4.3 billion, one hundred years ago. Currently the population is 5.2 billion. What will this population be 100 years from now? NOTE: Round to the nearest tenth of a billion.
Answer:
6.3 billion ( approx )
Step-by-step explanation:
Given,
The population of Neverland = 4.3 billion,
Let it is increasing by the rate of r % per year,
So, the population after 100 years,
[tex]A=4.3(1+\frac{r}{100})^{100}[/tex]
According to the question,
A = 5.2 billion,
[tex]\implies 5.2 = 4.3(1+\frac{r}{100})^{100}[/tex]
By the graphing calculator,
[tex]\implies r = 0.19\%[/tex]
If the initial population is 5.2 billion,
Then the population after 100 years,
[tex]A=5.2(1+\frac{0.19}{100})^{100}[/tex]
[tex]=6.28696444394[/tex]
[tex]\approx 6.3\text{ billion}[/tex]
Find the indicated area under the curve of the standard normal distribution; then convert it to a percentage and fill in the blank. About ______% of the area is between z equals minus 2 and z equals 2 (or within 2 standard deviations of the mean).
Final answer:
The area under the standard normal distribution curve between z = -2 and z = 2 corresponds to approximately 84.4 %.
Explanation:
To find the indicated area under the curve of the standard normal distribution between z = -2 and z = 2, we refer to a z-table that provides us with the area under the curve to the left of a given z-score.
First, we find the area under the normal curve to the left of z = 2, which typically is around 0.8672.
Since the normal distribution is symmetric about the mean, the area to the left of z = -2 is the same as the area to the right of z = 2, which is 1 - 0.8672 = 0.0228.
The total area between z = -2 and z = 2 is the area to the left of z = 2 minus the area to the left of z = -2, or 0.8672 - 0.0228.
The difference gives us approximately 0.8444, which represents the probability that a value falls within 2 standard deviations of the mean in a standard normal distribution.
Converting this to a percentage, we multiply by 100 to find that about 84.4 % of the area is within 2 standard deviations of the mean.