Answer:
[tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx = \frac{5}{4}[/tex]
General Formulas and Concepts:
Calculus
Integration
IntegralsIntegration Rule [Reverse Power Rule]: [tex]\displaystyle \int {x^n} \, dx = \frac{x^{n + 1}}{n + 1} + C[/tex]
Integration Rule [Fundamental Theorem of Calculus 1]: [tex]\displaystyle \int\limits^b_a {f(x)} \, dx = F(b) - F(a)[/tex]
Integration Property [Multiplied Constant]: [tex]\displaystyle \int {cf(x)} \, dx = c \int {f(x)} \, dx[/tex]
Area of a Region Formula: [tex]\displaystyle A = \int\limits^b_a {[f(x) - g(x)]} \, dx[/tex]
Step-by-step explanation:
Step 1: Define
Identify
[tex]\displaystyle f(x) = \frac{10}{x^2} \\\left[ 4 ,\ 8 \right][/tex]
Step 2: Find Area
Substitute in variables [Area of a Region Formula]: [tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx[/tex][Integral] Rewrite [Integration Property - Multiplied Constant]: [tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx = 10 \int\limits^8_4 {\frac{1}{x^2}} \, dx[/tex][Integral] Integrate [Integration Rule - Reverse Power Rule]: [tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx = 10 \bigg( \frac{-1}{x} \bigg) \bigg| \limits^8_4[/tex]Evaluate [Integration Rule - Fundamental Theorem of Calculus 1]: [tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx = 10 \bigg( \frac{1}{8} \bigg)[/tex]Simplify: [tex]\displaystyle \int\limits^8_4 {\frac{10}{x^2}} \, dx = \frac{5}{4}[/tex]Topic: AP Calculus AB/BC (Calculus I/I + II)
Unit: Integration
Crash testing is a highly expensive procedure to evaluate the ability of an automobile to withstand a serious accident. A simple random sample of 12 small cars were subjected to a head-on collision at 40 miles per hour. Of them 8 were "totaled," meaning that the cost of repairs is greater than the value of the car. Another sample of 15 large cars were subjected to the same test, and 5 of them were totaled. Find a 95% confidence interval for the difference in the prop
Answer:
95% confidence interval for the difference in the proportion is [-0.017 , 0.697].
Step-by-step explanation:
We are given that a simple random sample of 12 small cars were subjected to a head-on collision at 40 miles per hour. Of them 8 were "totaled," meaning that the cost of repairs is greater than the value of the car.
Another sample of 15 large cars were subjected to the same test, and 5 of them were totaled.
Firstly, the pivotal quantity for 95% confidence interval for the difference between population proportion is given by;
P.Q. = [tex]\frac{(\hat p_1-\hat p_2)-(p_1-p_2)}{\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] ~ N(0,1)
where, [tex]\hat p_1[/tex] = sample proportion of small cars that were totaled = [tex]\frac{8}{12}[/tex] = 0.67
[tex]\hat p_2[/tex] = sample proportion of large cars that were totaled = [tex]\frac{5}{15}[/tex] = 0.33
[tex]n_1[/tex] = sample of small cars = 12
[tex]n_2[/tex] = sample of large cars = 15
[tex]p_1[/tex] = population proportion of small cars that are totaled
[tex]p_2[/tex] = population proportion of large cars that were totaled
Here for constructing 95% confidence interval we have used Two-sample z proportion statistics.
So, 95% confidence interval for the difference between population population, ([tex]p_1-p_2[/tex]) is ;
P(-1.96 < N(0,1) < 1.96) = 0.95 {As the critical value of z at 2.5% level
of significance are -1.96 & 1.96}
P(-1.96 < [tex]\frac{(\hat p_1-\hat p_2)-(p_1-p_2)}{\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] < 1.96) = 0.95
P( [tex]-1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] < [tex]{(\hat p_1-\hat p_2)-(p_1-p_2)}[/tex] < [tex]1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] ) = 0.95
P( [tex](\hat p_1-\hat p_2)-1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] < [tex]p_1-p_2[/tex] < [tex](\hat p_1-\hat p_2)+1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] ) = 0.95
95% confidence interval for [tex]p_1-p_2[/tex] = [[tex](\hat p_1-\hat p_2)-1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex] , [tex](\hat p_1-\hat p_2)+1.96 \times {\sqrt{\frac{\hat p_1(1-\hat p_1)}{n_1}+\frac{\hat p_2(1-\hat p_2)}{n_2} } }[/tex]]
= [[tex](0.67-0.33)-1.96 \times {\sqrt{\frac{0.67(1-0.67)}{12}+\frac{0.33(1-0.33)}{15} } }[/tex] , [tex](0.67-0.33)+1.96 \times {\sqrt{\frac{0.67(1-0.67)}{12}+\frac{0.33(1-0.33)}{15} } }[/tex]]
= [-0.017 , 0.697]
Therefore, 95% confidence interval for the difference between proportions l and 2 is [-0.017 , 0.697].
A 5-card hand is dealt from a perfectly shuffled deck. Define the events: A: the hand is a four of a kind (all four cards of one rank plus a 5th card). B: at least one of the cards in the hand is an ace Are the events A and B independent? Prove your answer by showing that one of the conditions for independence is either true or false.
In a hand of 5 cards, you want 4 of them to be of the same rank, and the fifth can be any of the remaining 48 cards. So if the rank of the 4-of-a-kind is fixed, there are [tex]\binom44\binom{48}1=48[/tex] possible hands. To account for any choice of rank, we choose 1 of the 13 possible ranks and multiply this count by [tex]\binom{13}1=13[/tex]. So there are 624 possible hands containing a 4-of-a-kind. Hence A occurs with probability
[tex]\dfrac{\binom{13}1\binom44\binom{48}1}{\binom{52}5}=\dfrac{624}{2,598,960}\approx0.00024[/tex]
There are 4 aces in the deck. If exactly 1 occurs in the hand, the remaining 4 cards can be any of the remaining 48 non-ace cards, contributing [tex]\binom41\binom{48}4=778,320[/tex] possible hands. Exactly 2 aces are drawn in [tex]\binom42\binom{48}3=103,776[/tex] hands. And so on. This gives a total of
[tex]\displaystyle\sum_{a=1}^4\binom4a\binom{48}{5-a}=886,656[/tex]
possible hands containing at least 1 ace, and hence B occurs with probability
[tex]\dfrac{\sum\limits_{a=1}^4\binom4a\binom{48}{5-a}}{\binom{52}5}=\dfrac{18,472}{54,145}\approx0.3412[/tex]
The product of these probability is approximately 0.000082.
A and B are independent if the probability of both events occurring simultaneously is the same as the above probability, i.e. [tex]P(A\cap B)=P(A)P(B)[/tex]. This happens if
the hand has 4 aces and 1 non-ace, orthe hand has a non-ace 4-of-a-kind and 1 aceThe above "sub-events" are mutually exclusive and share no overlap. There are 48 possible non-aces to choose from, so the first sub-event consists of 48 possible hands. There are 12 non-ace 4-of-a-kinds and 4 choices of ace for the fifth card, so the second sub-event has a total of 12*4 = 48 possible hands. So [tex]A\cap B[/tex] consists of 96 possible hands, which occurs with probability
[tex]\dfrac{96}{\binom{52}5}\approx0.0000369[/tex]
and so the events A and B are NOT independent.
The events A and B in the given scenario are not independent. This determination is based on the principle of sampling without replacement, where drawing a four of a kind is likely to influence the probability of drawing an ace.
Explanation:Two events A: the hand is a four of a kind, and B: at least one of the cards in the hand is an ace, are defined in a situation where a 5-card hand is dealt from a perfectly shuffled 52-card deck. To determine if these events are independent, we need to check if the occurrence of event A affects the occurrence of event B.
In sampling with replacement, each member of a population is replaced after it is picked. However, dealing a 5-card hand from a deck of cards is an example of sampling without replacement, meaning that each card may only be chosen once, causing the events to be considered as not independent.
It is highly probable that drawing a four of a kind will influence the likelihood of drawing an ace. Hence, the events A and B are not independent.
Learn more about Independent Events here:https://brainly.com/question/30905572
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How many minutes does it take 7people to paint 4 walls ?
Bruh. More information is needed to answer that question. We need to know the rate of change.
Layla and Sam are both dog sitters. Layla charges $2 per day plus a sign-up fee of $3. Sam charges a flat rate of $3 per day. The system of linear equations below represents y, the total amount earned in dollars for x days of dog sitting.
A. Write the equation to represent Layla’s fees.
B. Write the equation to represent Sam’s fees.
C. After how many days do Layla and Sam earn the same amount for dog sitting?
What is that amount?
Answer:
a) [tex]L(t) = 3 + 2\cdot t[/tex], b) [tex]S (t) = 3\cdot t[/tex], c) Third day.
Step-by-step explanation:
a) The equation to represent Layla's fees is:
[tex]L(t) = 3 + 2\cdot t[/tex]
b) The equation to represent Sam's fees is:
[tex]S (t) = 3\cdot t[/tex]
c) Both earn the same amount for dog sitting at the third day.
Miguel buys textbook with a listed price of $81. Miguel uses
a discount that provides 10% off. What is the total final
price Miguel pays?
Answer:
$72
Step-by-step explanation:
Answer:
72.9 (mark me brainleist pls )
Step-by-step explanation:
81 x 0.10 = 8.1
81 - 8.1 = 72.9
ANSWER ONLY IF YK IT IM GIVING CORRECT BRAINLIEST
Factor the expression completely : -15x^3+5
Answer:
-5(3x^3-1)
Step-by-step explanation:
-15x^3+5
Factor out -5
-5(3x^3-1)
The data shows the weights of 2 groups of house cats in pounds.
Group 1
Group 2
6
8
8
10
8
10
9
11
10
12
14
15
15
15
18 20
15 21
Which statistic has a greater value for Group 1 than Group 2?
A
Mean
B. Range
C. Mode
D. Median
Reset
Final answer:
Upon calculating the mean, range, mode, and median for both groups of house cats, we found that none of the statistics have greater values for Group 1 than for Group 2.
Explanation:
To determine which statistic has a greater value for Group 1 than Group 2 in a dataset containing the weights of house cats, we first need to calculate the mean, range, mode, and median for both groups.
Calculations for Group 1:
Mean: (6+8+8+9+10+14+15+15+18+15) / 10 = 118 / 10 = 11.8 poundsRange: 18 - 6 = 12 poundsMode: 8 and 15 (Most frequent)Median: (10 + 14) / 2 = 24 / 2 = 12 pounds (since there's an even number of data points, we take the average of the two middle values)Calculations for Group 2:
Mean: (8+10+10+11+12+15+15+20+21) / 9 = 122 / 9 = 13.56 poundsRange: 21 - 8 = 13 poundsMode: 10 and 15 (Most frequent)Median: 12 pounds (since there's an odd number of data points, the median is the middle value)When comparing the statistics, we can see that the range of Group 1 is smaller than that of Group 2, and the mean and median for Group 1 are also smaller than those for Group 2. The mode for both groups is the same with two values that repeat the most. Therefore, none of the statistics have greater values for Group 1 than for Group 2.
Consider the following least squares specification between test scores and the student - teacher ratio: TestScore = 557.8 + 36.42 In (Income). According to this equation, a 1% increase income is associated with an increase in test scores of :A. 36.42 points B. cannot be determined from the information given here C. 0.36 points D. 557.8 points
Answer:
[tex] Test score_i= 557.8 +36.42 Income[/tex]
If we increase the income by 1% that means that the new income would be 1.01 the before one and if we replace this we got:
[tex] Test score_f = 557.8 + (36.42* 1.01 Income)= 557.8 +36.7842 Income[/tex]
And the net increase can be founded like this:
[tex] Test score_f -Tet score_i = 557.8 +36.7842 Income- [557.8 +36.42 Income] = 36.7842 Income -36.42 Income = 0.3642[/tex]
So then the net increase would be:
C. 0.36 points
Step-by-step explanation:
For this case we have the following linear relationship obtained from least squares between test scores and the student-teacher ratio:
[tex] Test score_i= 557.8 +36.42 Income[/tex]
If we increase the income by 1% that means that the new income would be 1.01 the before one and if we replace this we got:
[tex] Test score_f = 557.8 + (36.42* 1.01 Income)= 557.8 +36.7842 Income[/tex]
And the net increase can be founded like this:
[tex] Test score_f -Tet score_i = 557.8 +36.7842 Income- [557.8 +36.42 Income] = 36.7842 Income -36.42 Income = 0.3642[/tex]
So then the net increase would be:
C. 0.36 points
For a 1% increase in income, the test scores would increase by approximately 0.36 points based on the given regression equation. This is calculated by multiplying the coefficient of the natural logarithm of income, 36.42, with the decimal value of the percent change in income, which is 0.01.
Explanation:The equation provided is a linear regression equation where the dependent variable, TestScore, is predicted based on the natural logarithm of the independent variable, Income. The coefficient of 36.42 in front of the natural logarithm indicates how much the dependent variable changes for a 1% change in the independent variable. To find the contribution to the test scores for a 1% increase in income, we need to use the fact that the derivative of the natural logarithm, Ln(x), with respect to x is 1/x, which means a change in income translates directly to the change in test score when multiplied by the coefficient.
So, for a small percentage change in income, approximately 1%, the corresponding change in TestScore is 36.42 multiplied by the percentage change in decimal form. Specifically, 0.01 × 36.42 = 0.3642 or approximately 0.36 points.
Nadia is making a rectangular moisac out of 1/2 -inch by 1/2 -inch tiles. The rectangle is 12 inches long and 3 1/2 inches wide. How many tiles will nadia use to cover the rectangle completely
Answer:
168
Step-by-step explanation:
GIVEN: Nadia is making a rectangular moisac out of [tex]\frac{1}{2}[/tex] inch by [tex]\frac{1}{2}[/tex] inch tiles. The rectangle is [tex]12[/tex] inches long and [tex]3\frac{1}{2}[/tex] inches wide.
TO FIND: How many tiles will Nadia use to cover the rectangle completely.
SOLUTION:
Area of rectangular moisac[tex]=\text{length}\times\text{width}[/tex]
[tex]=12\times3\frac{1}{2}=\frac{12\times7}{2}[/tex]
[tex]=42 \text{ inch}^2[/tex]
Area of one tile [tex]=\text{side}^2[/tex]
[tex]=\frac{1}{2}\times\frac{1}{2}=\frac{1}{4}\text{ inch}^2[/tex]
According to question
Total tiles required [tex]=\frac{\text{Area of rectangular moisac}}{\text{Area of one tile}}[/tex]
[tex]=\frac{42}{\frac{1}{4}}=42\times4[/tex]
[tex]=168[/tex] tiles
Hence, 168 tiles are required to completely cover the rectangular moisac.
What is 10x5??? Help
Answer:
The actual Answer is 10x5=50
Answer: 50
Step-by-step explanation: it’s like when you get 10 and add it up 5 times you get 50
He takes a random sample of 49 recent charterholders and computes a mean salary of $172,000 with a standard deviation of $35,000. Use this sample information to determine the 90% confidence interval for the average salary of a CFA charterholder.
Answer:
the 90% of confidence intervals for the average salary of a CFA charter holder
(1,63,775 , 1,80,000)
Step-by-step explanation:
Explanation:-
random sample of n = 49 recent charter holders
mean of sample (x⁻) = $172,000
standard deviation of sample( S) = $35,000
Level of significance α= 1.645
90% confidence interval
[tex](x^{-} - Z_{\alpha } \frac{s}{\sqrt{n} } , x^{-} + Z_{\alpha } \frac{s}{\sqrt{n} })[/tex]
[tex](172000 - 1.645 \frac{35000}{\sqrt{49} } , 172000 +1.645 \frac{35000}{\sqrt{49} })[/tex]
on calculation , we get
(1,63,775 , 1,80,000)
The mean value lies between the 90% of confidence intervals
(1,63,775 , 1,80,000)
Auto pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of 10 pistons produced each day, the mean and the range of this diameter have been as follows:
Day Mean Bold x overbar (mm) Range R (mm)
1 158.9 4.0
2 151.2 4.6
3 155.6 4.3
4 155.5 5.0
5 154.6 4.3
a) What is the value of x ?
Missing part of the question
b)What is the value of R?
Answer:
a. X = 155.2
b. R = 4.4
Step-by-step explanation:
a. Calculating the value of x.
The value of x is the mean of the mean observation; i.e. the mean column
Mean is calculated as: the summation of all observation divided by the number of observations.
Summation of Observation = 158.9 + 151.2 + 155.6 + 155.5 + 154.6
Summation of Observation = 775.8
Number of Observations = 5
X = Mean = 775.8/5
X = 155.16
X = 155.2 ----- Approximated to 1 decimal place
b. Calculating the value of R.
The value of R is the mean/average of the Range
Mean is calculated as: the summation of all observation divided by the number of observations.
Summation of Observation = 4.0 + 4.6 + 4.3 + 5.0 + 4.3
Summation of Observation = 22.2
Number of Observations = 5
R = Mean = 22.2/5
R = 4.44
R = 4.4 ----- Approximated to 1 decimal place
The average diameter [tex](\( \overline{x} \))[/tex] of the pistons from the provided data is 155.16 mm, calculated by summing the daily means and dividing by the number of days.
In the context provided, [tex]\( \overline{x} \)[/tex] refers to the average of the piston diameters measured across different days at Wemming Chung's plant.
To find this value, we need to calculate the mean of the daily means [tex](\( \overline{x} \))[/tex] which are 158.9, 151.2, 155.6, 155.5, and 154.6 mm. This is done by summing these values and dividing by the number of days (5 in this case).
[tex]\[ \overline{x} = \frac{158.9 + 151.2 + 155.6 + 155.5 + 154.6}{5} \][/tex]
[tex]\[ \overline{x} = \frac{775.8}{5} \][/tex]
[tex]\[ \overline{x} = 155.16 \text{ mm} \][/tex]
Hence, the value of [tex]\( \overline{x} \)[/tex] is 155.16 mm.
whats the slope of the graph -4, 5 1,-7.5
Answer:
Slope (m)= -12.5/5= -2.5
-12.5/5 in fraction form
or
-2.5 in decimal form
Step-by-step explanation:
slope (m)= -12.5/5= -2.5
the points belong as a decreasing linear function
equation: y= -2.5x-5
Which of the following is an example of a subjective probability? A. Although College A has never played College B in basketball, a sports analyst believes there is a 0.8 probability that A will beat B in their upcoming game. B. Based on many years of data, an automobile insurance company estimates the probability that a randomly chosen 20-year old driver will have an accident during his 20th year as 0.001. C. After examining a deck of cards to determine that there are 52 cards of the correct suits and values, a card player says the probability of drawing the 7 of hearts is 1/52. D. After examining a coin to determine that it is an unaltered coin produced by the U.S. Mint, a gambler says the probability of a coin flip coming up heads is 1/2.
Answer:
The answer is option A.
Step-by-step explanation:
Subjective probability is defined as a probability which is derived from a person's own experience or belief without relying on any data or scientific calculation.
In the question, the situation given in option A is an example of subjective probability because the analyst is giving a probability based on his or her own belief without using any data at all.
The other options clearly state the probability is being calculated by relying on observations and data.
I hope this answer helps.
A subjective probability example is the belief of a sports analyst in the probability of one college team beating another, without prior data. This contrasts with objective probabilities based on statistical analysis or historical evidence.
Explanation:The example of a subjective probability among the options given is when a sports analyst believes there is a 0.8 probability that College A will beat College B in their upcoming basketball game, despite there being no previous encounters between the two teams to base this on. This type of probability, which includes personal belief or judgment rather than empirical evidence and statistical analysis, contrasts with objective probabilities that rely on historical data, such as the probability of a 20-year old driver having an accident or the probability of drawing a specific card from a standard deck.
Subjective probability is used in situations where there is a lack of historical data or when assessing future events, making it a personal estimation. This approach is different from calculating probabilities based on observed outcomes and statistical independence, where the probability of events is determined through analysis and empirical evidence.
find slope of P(0,0), Q(10,8)
Answer:
4/5
Step-by-step explanation:
We can find the slope when given two points by using
m= (y2-y1)/(x2-x1)
= (8-0)/(10-0)
=8/10
= 4/5
Answer:
4/5
Step-by-step explanation:
Which expression is equivalent to 8-(6r+2)?
Answer:
6(1-r)
Step-by-step explanation:
8-6r+2
=6-6r
=6(1-r)
PLLLLZZZ HELP ME. Given the function f(x)=3x^2-2x-5 : What are the zeros for this function? 5 extra credit points for an exact answer. 30 points if you get the exact answer and its 100% Correct.
Answer:
The zeros for this function are x = -1 and x = 1.67
Step-by-step explanation:
Solving a quadratic equation:
Given a second order polynomial expressed by the following equation:
[tex]ax^{2} + bx + c, a\neq0[/tex].
This polynomial has roots [tex]x_{1}, x_{2}[/tex] such that [tex]ax^{2} + bx + c = (x - x_{1})*(x - x_{2})[/tex], given by the following formulas:
[tex]x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}[/tex]
[tex]x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}[/tex]
[tex]\bigtriangleup = b^{2} - 4ac[/tex]
In this question:
[tex]f(x) = 3x^{2} - 2x - 5[/tex]
The zeros of the function are the values of x for which
[tex]f(x) = 0[/tex]
Then
[tex]3x^{2} - 2x - 5 = 0[/tex]
This means that [tex]a = 3, b = -2, c = -5[/tex]
Then
[tex]\bigtriangleup = (-2)^{2} - 4*3*(-5) = 64[/tex]
[tex]x_{1} = \frac{-(-2) + \sqrt{64}}{2*3} = 1.67[/tex]
[tex]x_{2} = \frac{-(-2) - \sqrt{64}}{2*3} = -1[/tex]
The zeros for this function are x = -1 and x = 1.67
PLEASE HURRY!! The pictures Please!!!
Which inequality is represented by this graph?
A. 0>x
B. x>0
C.0>_x
D. 0>_0
X > 0
sdjkfgsdjfjkdfnejnwsfjdnsk it made me write more
Since the blue line points to numbers more positive then 0, it would be a greater then. Since the dot is open it would be greater then and not equal to.
Therefore the answer is B, x > 0
My locker combination has three digits. None of the digits are 0. What is the probability that the first digit of my locker combination is less than 3? A. 1/3 B. 1/2 C. 2/9 D. 3/10
The probability that the first digit of a three-digit locker combination is less than 3 is 2/9, because there are 2 favorable digits (1 and 2) out of 9 possible non-zero digits, option C.
The question is asking about the probability that the first digit of a three-digit locker combination is less than 3, given that none of the digits can be 0. Since the digits can range from 1 to 9 (inclusive), there are a total of 9 possible digits for the first position. We are interested in the digits 1 and 2, which are the only digits less than 3. Therefore, there are 2 favorable outcomes.
To calculate the probability, we use the formula:
Probability = Number of favorable outcomes / Total number of possible outcomes
In this case, the probability is 2 (favorable outcomes) divided by 9 (possible outcomes), which simplifies to:
Probability = 2/9, option C.
Suppose that the population of the scores of all high school seniors that took the SAT-M (SAT math) test this year follows a Normal distribution, with mean μ and standard deviation σ = 100. You read a report that says, "On the basis of a simple random sample of 100 high school seniors that took the SAT-M test this year, a confidence interval for μ is 512.00 ± 25.76." The confidence level for this interval is
Answer:
The confidence level for this interval is 99%.
Step-by-step explanation:
The margin of error M has the following equation.
[tex]M = z*\frac{\sigma}{\sqrt{n}}[/tex]
In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.
z is related to the confidence level.
In this problem:
[tex]M = 25.76, \sigma = 100, n = 100[/tex]
So
[tex]25.76 = z*\frac{100}{\sqrt{100}}[/tex]
[tex]10z = 25.76[/tex]
[tex]z = 2.576[/tex]
Looking at the z table, [tex]z = 2.576[/tex] has a pvalue of 0.995.
So the confidence level is:
[tex]1 - 2(1 - 0.995) = 1 - 0.01 = 0.99[/tex]
The confidence level for this interval is 99%.
What is the formula for the expected number of successes in a binomial experiment with n trials and probability of success p? Choose the correct forumla below.
A. Upper E (Upper X )equalsStartRoot np (1 minus p )EndRoot
B. Upper E (Upper X )equalsp Superscript n
C. Upper E (Upper X )equals (1 minus p )Superscript n(1 minus p )Superscript n
D. Upper E (Upper X )equalsnp
Answer:
[tex](D)E[ X ] =np.[/tex]
Step-by-step explanation:
Given a binomial experiment with n trials and probability of success p,
[tex]f(x)=\left(\begin{array}{c}n\\k\end{array}\right)p^x(1-p)^{n-x}, 0\leq x\leq n[/tex]
[tex]E(X)=\sum_{x=0}^{n}xf(x)= \sum_{x=0}^{n}x\left(\begin{array}{c}n\\k\end{array}\right)p^x(1-p)^{n-x}[/tex]
Since each term of the summation is multiplied by x, the value of the term corresponding to x = 0 will be 0. Therefore the expected value becomes:
[tex]E(X)=\sum_{x=1}^{n}x\left(\begin{array}{c}n\\x\end{array}\right)p^x(1-p)^{n-x}[/tex]
Now,
[tex]x\left(\begin{array}{c}n\\x\end{array}\right)= \frac{xn!}{x!(n-x)!}=\frac{n!}{(x-)!(n-x)!}=\frac{n(n-1)!}{(x-1)!((n-1)-(x-1))!}=n\left(\begin{array}{c}n-1\\x-1\end{array}\right)[/tex]
Substituting,
[tex]E(X)=\sum_{x=1}^{n}n\left(\begin{array}{c}n-1\\x-1\end{array}\right)p^x(1-p)^{n-x}[/tex]
Factoring out the n and one p from the above expression:
[tex]E(X)=np\sum_{x=1}^{n}n\left(\begin{array}{c}n-1\\x-1\end{array}\right)p^{x-1}(1-p)^{(n-1)-(x-1)}[/tex]
Representing k=x-1 in the above gives us:
[tex]E(X)=np\sum_{k=0}^{n}n\left(\begin{array}{c}n-1\\k\end{array}\right)p^{k}(1-p)^{(n-1)-k}[/tex]
This can then be written by the Binomial Formula as:
[tex]E[ X ] = (np) (p +(1 - p))^{n -1 }= np.[/tex]
The correct formula for the expected number of successes in a binomial experiment with n trials and probability of success p is μ = np (Option D), which means that the expected number of successes is calculated by multiplying the total number of trials by the probability of success.
Explanation:The formula for the expected number of successes in a binomial experiment with n trials and probability of success p is given by μ = np. In this formula, 'n' represents the number of trials, and 'p' is the probability of success on each trial. Therefore, the correct option, in this case, is D. Upper E (Upper X ) equals np.
This essentially means that the expected number of successes is obtained by multiplying the total number of trials by the probability of success. For instance, if you were to flip a coin (where the probability of getting heads is 0.5) 10 times, the expected number of times you'd get heads would be 0.5 * 10 = 5.
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Jonas earns $77 in 7 hours. At this rate, how many dollars will he earn in 20 hours?
Answer:
$220?
Step-by-step explanation:
Answer$220
Step-by-step explanation:
77/7=$11 so $11x20=220
Chapin Manufacturing Company operates 24 hours a day, five days a week. The workers rotate shifts each week. Management is interested in whether there is a difference in the number of units produced when the employees work on various shifts. A sample of five workers is selected and their output recorded on each shift.
Units Produced
Employee Day Afternoon Night
Skaff 38 24 34
Lum 35 23 37
Clark 28 26 38
Treece 35 26 23
Morgan 22 23 24
1. At the 0.01 significance level, can we conclude there is a difference in the mean production rate by shift or by employee?
Answer:
The answer is there is a difference in the mean production rate by shift
Step-by-step explanation:
The level of significance is actually very low since the same production level is maintained for each of the 5 workers at the same time in the afternoon.
As for the other shifts, that is, the day shift and the night shift, the level of significance varies according to the production established by each worker.h
Miss Perkins want to rent a car for a day. It will cost a daily fee of $75 plus $.55 per mile driven. M equals the number of miles Miss Perkins drive for the day. Write an expression that shows the amount she will pay for the car. Evaluate the expression you wrote to find them out Miss Perkins will pay if she drive 300 miles.
Answer:
.55M + 75 = the total cost
.55(300) + 75 = $240
Step-by-step explanation:
Write a polynomial equation of degree 4 that has the following roots : -1 repeated three times and 4.
Answer:
p(x) = x^4 - x^3 - 9x^2 - 11x - 4
Step-by-step explanation:
You are saying there are 3 roots of x = -1 and one x = 4 root
so...
p(x) = [(x + 1)^3 ] * (x - 4)
p(x) = (xxx + 3xx + 3x + 1 )*(x- 4)
p(x) = x^4 + 3 x^3 + 3x^2 + x - 4x^3 - 12xx - 12x - 4
p(x) = x^4 - x^3 - 9x^2 - 11x - 4
Answer: yes
Step-by-step explanation:
do u by chance still have access to those units on odyssey would love to get the answers lol.
A regular heptagon has a side of 13.9 and an apothem of 14.4. Find the area of the heptagon. Round your answer to the nearest WHOLE NUMBER.
Answer:
Step-by-step explanation:
Given that,
A regular heptagon, a heptagon has 7 sides and since it is a regular heptagon, then, it has equal sides
n = 7, number of sides
Each sides of the heptagon has a length of 13.9
s= 13.9
The apothem is 14.4
Apothem is a line from the centre of a regular polygon at right angles to any of its sides.
r = 14.4
The area of a regular heptagon can be calculated using
Area = ½ n•s•r
Where n is the number of sides
s- is the length of the sides
r Is the apothem
Then,
A = ½ × 7 × 13.9 × 14.4
A = 700.56 square units
To the nearest whole number, I.e no decimal points
A = 701 Square units
Help me! ? Its math and I I bad at it!!!!!!!
Answer:
C. 31
Step-by-step explanation:
(570.7 - n) ÷ 16
(570.7 - 74.7) ÷ 16
496 ÷ 16
31
The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is 2643 miles, with a standard deviation of 368 miles. If he is correct, what is the probability that the mean of a sample of 44 cars would differ from the population mean by less than 51 miles
Final answer:
To find the probability that the mean of a sample of 44 cars would differ from the population mean by less than 51 miles, use the Central Limit Theorem to approximate the distribution of sample means. Calculate the standard error using the formula: standard error = population standard deviation / sqrt(sample size). Then, standardize the sample mean using the z-score formula. Finally, find the probability using a standard normal distribution table or a calculator.Therefore, the probability that the mean of a sample of 44 cars would differ from the population mean by less than 51 miles is approximately 0.3595, or 35.95%.
Explanation:
To find the probability that the mean of a sample of 44 cars would differ from the population mean by less than 51 miles, we can use the Central Limit Theorem. According to the Central Limit Theorem, the distribution of sample means approximates a normal distribution, regardless of the shape of the population distribution, as long as the sample size is large enough (typically n ≥ 30).
First, we need to calculate the standard error, which is the standard deviation of the sampling distribution of the sample mean. The standard error is given by the formula: standard error = population standard deviation / sqrt(sample size). In this case, the population standard deviation is 368 miles, and the sample size is 44. Therefore, the standard error = 368 / sqrt(44) = 55.354 miles.
Next, we use the z-score formula to standardize the sample mean. The z-score = (sample mean - population mean) / standard error. Plugging in the given values, we get: z-score = (51 - 2643) / 55.354 = -0.3668.
Finally, we need to find the probability that the standardized sample mean (z-score) is less than -0.3668. We can use a standard normal distribution table or a calculator to find the corresponding probability. From the standard normal distribution table, we find that the probability corresponding to a z-score of -0.3668 is approximately 0.3595. Therefore, the probability that the mean of a sample of 44 cars would differ from the population mean by less than 51 miles is approximately 0.3595, or 35.95%.
Michaela says that |3| is bigger than |-3|.
Is Michaela’s statement true or false?
Answer:
False
Step-by-step explanation:
Because with the lines on the outside automatically changes the number to a positive number so, therefor the numbers are equal hope this help.
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Michaela's statement that |3| is bigger than |-3| is true.
Explanation:Michaela's assertion that |3| is greater than |-3| is accurate. The absolute value of a number represents its distance from zero on the number line. In this case, |3| signifies a 3-unit distance from zero, and |-3| also corresponds to a 3-unit distance from zero. Since both values are equidistant from zero, their magnitudes are equal. Consequently, |3| and |-3| both have a value of 3, emphasizing that the absolute value of a number signifies its distance from zero, regardless of its sign, and in this case, both distances are identical at 3 units.
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Find the exact circumference of a circle with the given radius.
7 feet
C=
75 ft.
145 ft.
275 ft.
Answer:
the answer is 44
you don't have the answer choice