Suppose you select a ball by first picking one of two boxes at random and then selecting a ball from this box. The first box contains two white balls and three blue balls and the second box contains four white balls and one blue ball. What is the probability that you picked a ball from the first box if you have drawn a blue ball

Answer:

56.

Step-by-step explanation:

That is the number of permutations of 2 from 8

= 8P2

= 8!/(8-2)!

= 8!/6!

= 8 * 7

= 56.

Answer:57

Step-by-step explanation:

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Answer:

$169

Step-by-step explanation:

Sara must pay the entry fee, and then a fee of 18$/month. if she is a member for 8 months the total paid must be

[tex]25 + 18*8 = 169[/tex]

Answer:

$169

Step-by-step explanation:

25+18m=$

m represents the months she participates for

25+18(8)=$

25+144=$

169=$

She pays $169 to be in a fruit club. Wow.

Part a)

We have that,the distribution of finishing time for men was approximately normal with mean 242 minutes and standard deviation 29 minutes.

We want to calculate and interpret the standardized score for Clay's marathon time, if the finishing time for Clay was 289 minutes.

We use the formula:

[tex]z = \frac{x - \bar x}{s} [/tex]

we substitute the values to get:

[tex]z = \frac{289 - 242}{29} [/tex]

[tex]z = 1.62[/tex]

This means Clay's finishing time is 1.62 standard deviation above the mean finishing time.

Part b)

This time, we have that, the distribution of finishing time for women was approximately normal with mean 259 minutes and standard deviation 32 minutes.

We want to find the proportion of women who ran the marathon that had a finishing time less than Kathy if the finishing time for Kathy was 272 minutes.

We first calculate the z-score to get:

[tex]z = \frac{272 - 259}{32} = 0.41[/tex]

From the normal standard distribution table P(z<0.41)=0.6591.

This means 65.91% of women had a finishing time less than Kathy's finishing time.

Part c

The standard deviation of a data set tells us how far away the individual data are from the mean.

If the standard deviation of finishing time is greater for women than men, it means the finishing time for women are farther from the mean finishing time than that of men.

Using the normal distribution, it is found that:

a) His standardized score was of z = 1.6, which means that his finishing time is of 1.6 standard deviations above the mean finishing time for all men.

b) 0.6591 = 65.91% of women who ran the marathon had a finishing time less than Kathy's.

c) The higher standard deviation shows that the finishing times of the women who ran the marathon are more spread out compared to the finishing times of the men who ran the marathon.

In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

Item a:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{289 - 242}{29}[/tex]

[tex]Z = 1.6[/tex]

His standardized score was of z = 1.6, which means that his finishing time is of 1.6 standard deviations above the mean finishing time for all men.

Item b:

The proportion is the p-value of Z when X = 272, thus:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{272 - 259}{32}[/tex]

[tex]Z = 0.41[/tex]

[tex]Z = 0.41[/tex] has a p-value of 0.6591.

0.6591 = 65.91% of women who ran the marathon had a finishing time less than Kathy's.

Item c:

The higher standard deviation shows that the finishing times of the women who ran the marathon are more spread out compared to the finishing times of the men who ran the marathon.

A similar problem is given at https://brainly.com/question/24855678

Answer:

True

I hope this helps :)

Answer:

True

Step-by-step explanation:

True because there are only negative numbers in the calculation. Zero pairs are formed when a positive and a negative number are added

Answer:

-2

or

A.

Step-by-step explanation:

on edge 2020

Answer:

[tex]\£465.31[/tex]

Step-by-step explanation:

we know that

The insurance company reduces the price by 2.1%

Remember that

The actual cost of £475.29 a year represent the 100%

so

[tex]100\%-2.1\%=97.9\%=97.9/100=0.979[/tex]

To find out the new insurance cost, multiply the original cost by the factor 0.979

[tex]\£475.29(0.979)=\£465.31[/tex]

Brian's car insurance, after a 2.1% reduction from the original cost of £475.29, is now £465.31 when rounded to two decimal places.

Brian's original car insurance cost is £475.29, and the company is offering a reduction of 2.1% on this cost. To calculate the reduced cost, we first find the discount amount by multiplying the original cost by the reduction percentage:

Discount = Original Cost x Reduction Percentage

Discount = £475.29 x 0.021

Discount = £9.98109

Now, we subtract the discount from the original cost to find the new cost of the insurance:

New Cost = Original Cost - Discount

New Cost = £475.29 - £9.98109

New Cost = £465.30891

When rounding to two decimal places, Brian's new cost for car insurance is:

New Cost = £465.31

Answer: a) 0.6, b) [tex]\dfrac{4}{15}[/tex]

Step-by-step explanation:

Since we have given that

Total number of people were surveyed = 150

Number of people that like comedies they bought popcorn that day = 90

Number of people that said they do not buy popcorn = 40

So, Probability of getting who like comedies and bought popcorn = [tex]\dfrac{90}{150}=\dfrac{3}{5}=0.6[/tex]

Probability of getting who said they do not buy popcorn = [tex]\dfrac{40}{150}=\dfrac{4}{15}[/tex]

Hence, a) 0.6, b) [tex]\dfrac{4}{15}[/tex]

Answer:

C.1/6

Step-by-step explanation:

Answer:

so f(0) = g(0)   and f(2) = g(2)

Step-by-step explanation:

f(x) = g(x) where the two graphs intersect

The graphs cross at the x coordinate 0  and x coordinate 2

so f(0) = g(0)   and f(2) = g(2)

Answer:

First one

Step-by-step explanation:

f(x) = g(x)

Is the point of intersection of the two graphs

(0,4) and (2,0)

Solutions are: x = 0 and x = 2

Answer:

3

Step-by-step explanation:

logb(8)

logb(2³)

3 × logb(2)

3 × 1

3

Answer:

16 ft

Step-by-step explanation:

Hi there,

The formula for the area of a rectangle is A = b*h.

So, let's start out by plugging in what we know.

240 = 15h

Now, solve for h by dividing both sides by 15

h = 16

So, the height of the rectangle is 16 ft

Hope this helps! Stay safe!

- Emily

Answer:

Correct option is (c).

Step-by-step explanation:

The experiment is conducted to determine whether a new fertilizer affects the yield of tomato plants.

The procedure involves randomly assigning the new fertilizer to 20 plants and the other 20 will be assigned the current fertilizer.

Then the mean number of tomatoes produced per plant will be recorded for each fertilizer, and the difference in the sample means will be calculated.

The collected sample data will then be used to make conclusion about the population.

The researchers main aim is to determine whether the new fertilizer is effective or not, i.e. if on using the new fertilizer the yield of tomatoes increases or not.

So, the parameter under study id the difference between tow population means.

To make inferences about the experiment the researcher can construct a two-sample t-interval for a difference between population means. The confidence interval has a certain specific probability of including the true parameter value.

Thus, the correct option is (c).

The correct answer is (c) option.

The following information should be considered:

Learn more: https://brainly.com/question/17429689?referrer=searchResults

Answer:

E

Step-by-step explanation:

-18x + 21 > -15

-18x > -36

x < 2

20x - 13》17

20x》40

x》2

Or is union

Union of x < 2 and x》2 is all real numbers

Answer:$15

Step-by-step explanation:

45 divided by 3 =15

Answer:

her brother has $15

Step-by-step explanation:

m= molly

b= brother

m=45

b= 45÷3

b=15

Answer:

15

Step-by-step explanation:

Hello!

To find the median, all you have to do is order the number of terms in ascending order and then count to the middlemost number(s).

Arranging in ascending order:

[tex]6,\:12,\:14,\:15,\:15,\:18,\:19,\:19[/tex]

Since this is an even number, our two medians are 15 and 15.

(15 + 15) / 2 = 15.

Thus, the median of successful free throws is [tex]\boxed{15}[/tex].

Answer:

79 years old

Step-by-step explanation:

Let's say your age is x.

The problem says "500 reduced by 4 times my age is 184", so we convert this to math:

- "4 times my age" ⇒ 4 * x = 4x

- "500 reduced by" ⇒ 500 - (something)

- "500 reduced by 4 times my age" ⇒ 500 - 4x

- "is 184" ⇒ = 184

- "500 reduced by 4 times my age is 184" ⇒ 500 - 4x = 184

Now, we simply solve for x:

500 - 4x = 184

4x = 500 - 184 = 316

x = 79

Thus, you are 79 years old.

Hope this helps!

The scale of the drawing to the new barn is 1:1.5.

To find the scale of the new barn compared to the existing barn, we can use the ratio of their sides. Let's call the shortest side of the new barn x meters. The ratio of the lengths of the shortest sides of the new and existing barns is given as 2/3. Setting up the proportion, we have 2/3 = x/150. Cross-multiplying, we find x = (2/3) * 150 = 100 meters. Therefore, the shortest side of the new barn measures 100 meters. The scale of the drawing to the new barn can be determined by dividing the length of the shortest side of the drawing by the length of the shortest side of the new barn. Let's call the scale factor y. We have y = 150/100 = 1.5. Therefore, the scale of the drawing to the new barn is 1:1.5.

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-6.75 is a rational number since it can be expressed as a fraction of two integers. It's also a real number, but it's not a natural, whole, integer, or irrational number.

The number -6.75 is a Rational Number. Here's why:

A Natural Number is a number that is a positive integer, which would not include -6.75 because it is negative. A Whole Number is a number without fractional components, so -6.75 isn't a whole number as it has a fractional part. An Integer is a whole number that can be positive, negative, or zero, but does not include fractions or decimals, therefore, -6.75 isn't an integer. A Rational Number is a number that can be expressed as a fraction of two integers, and since -6.75 can be written as -675/100, it falls into this category. Since all rational numbers are included in the Real Number set, -6.75 is also a real number. However, an Irrational Number cannot be expressed as a ratio of two integers, which means that -6.75 isn't irrational.

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Answer:

Scale factor = 1/2

Ratio R:T = 2:1

Attached is the missing image;

Step-by-step explanation:

From the image attached;

The height of the triangle T is = 5 units

Base of triangle T = 4 units

Since the two triangles are scaled versions;

Area of a triangle = 1/2 × h × b

For triangle R;

Area = 40 = 1/2 × h × b

hb = 80

And, h : b = 5:4

h= 5/4 b

5/4 ×b × b = 80

b^2 = 64

b = 8

h = 5/4 × 8 = 10

The height of the triangle R = 10 units

Base of triangle R = 8 units

Scale factor = h2/h1 = 5/10 = 1/2

Scale factor = 1/2

Answer:

9

Step-by-step explanation:

just replace the x with 2 and solve

4(2)+1

8+1

= 9

Answer:

The distance between them is 366.75 feet.

She doesn't need to sound a warning yet.

Step-by-step explanation:

Please see the attached files for explanation.

To find the Distance between ships, we can use trigonometry. The distance between the ships is the absolute difference between their heights above the horizontal.

To find the distance between the two ships, we can use trigonometry. Let's consider the triangle formed by the lighthouse, ship 1, and ship 2. The angle of depression to ship 1 is 20°, so the angle between the line of sight and the horizontal is also 20°. Similarly, the angle of depression to ship 2 is 12.5°, so the angle between the line of sight and the horizontal is also 12.5°.

We can use the tangent function to find the height of ship 1 and ship 2 above the horizontal. Using the formula tan(angle) = opposite/adjacent, we have: tan(20°) = height of ship 1/208 and tan(12.5°) = height of ship 2/208. Rearranging these equations, we get the heights: height of ship 1 = 208 * tan(20°) and height of ship 2 = 208 * tan(12.5°).

Now, to find the distance between the ships, we need to subtract the heights of the ships from each other. If the distance is less than 300 feet, the keeper will sound a warning. So, the distance between the ships is: distance = |height of ship 1 - height of ship 2|. If this distance is less than 300 feet, she will sound the warning.

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Answer:

Using the empirical rule, the probability of a zebra living less than 32.2 years is about [tex] \\ P(z<3) = P(x<32.2) = 0.9985[/tex] or about 99.85%.

Step-by-step explanation:

Roughly speaking, the empirical rule tells us that, in a normal distribution, the distance of one standard deviation from the mean, above and below it, contains approximately 68% of the observations of the normally distributed data; two standard deviations from the mean, above and below it, 95% of the data, and, finally, the distance of three standard deviations from the mean, above and below it, contains 99.7% of the data, approximately.

To estimate probabilities with this rule, we need to use, at least, two concepts: the standard normal distribution and the z-scores. A standard normal distribution is a normal distribution with mean = 0 and standard deviation = 1. It represents standardized data. This standardized data are those coming from a normal distribution and commonly called raw data. The way to standardized them is using the z-scores:

[tex] \\ z = \frac{x - \mu}{\sigma}[/tex] [1]

Where

x represents raw data. In this case, x = 32.2 years.

[tex] \\ \mu[/tex] is the population mean. In this case, [tex] \\ \mu = 20.5[/tex] years.

[tex] \\ \sigma[/tex] is the population standard deviation. In this case, [tex] \\ \sigma = 3.9[/tex] years.

Then, using [1], we "transform" the raw score into a z-score (a standardized value) and then use this to find the corresponding probability using the standard normal distribution (or the cumulative standard normal distribution to be more precise), available in any Statistics book or on the Internet.

However, applying the empirical rule, we can estimate those probabilities faster but in an approximate way.

Let us take the corresponding z-score:

[tex] \\ z = \frac{x - \mu}{\sigma}[/tex]

[tex] \\ z = \frac{32.2 - 20.5}{3.9}[/tex]

[tex] \\ z = \frac{11.7}{3.9}[/tex]

[tex] \\ z = 3[/tex]

That is, the value z = 3 tells us the raw score 32.2 years is three standard deviations from the mean. In other words, 99.7% of the values are between z = -3 and z = 3. However, we are asked for P(z<3). The remaining area is below z = -3 and above z = 3. Since the normal distribution is symmetrical, we have to divide the remaining area by 2. That is, (1 - 0.997)/2 = 0.003/2 = 0.0015.

The area below z = -3 is, therefore, 0.0015, as well as above z = 3 or P(z<-3) = P(z>3) = 0.0015. The only area that not correspond to P(z<3) is P(z>3). As a result, we need to add the area below z = -3 (0.0015) to the value of 0.997 to finally have P(z<3).

Then

[tex] \\ P(z<3) = P(x<32.2) = 0.997 + P(z<-3)[/tex]

[tex] \\ P(z<3) = P(x<32.2) = 0.997 + 0.0015[/tex]

[tex] \\ P(z<3) = P(x<32.2) = 0.9985[/tex]

Thus, using the empirical rule, the probability of a zebra living less than 32.2 years is about [tex] \\ P(z<3) = P(x<32.2) = 0.9985[/tex].

In the graph below, we have a representation of the area below z = 3 or P(z<3) = P(x<32.2) is, approximately, 0.9985 or 99.85%.

Notice that using the cumulative standard normal table, as explained before, we have that P(z<3) = 0.99865.

Answer: 68, if the question asks between 16.6 and 24.4 years. 99.85, if the question asks for less.

Step-by-step explanation:

Answer:

1.12 = 28 / 25

Step-by-step explanation:

28 over 25

28

---

25

BRAINLIST please have a great day

Answer:

28/25

Step-by-step explanation:

hope this helps.

Answer:

  11

Step-by-step explanation:

Let e represent the number of students with blue eyes. Then the number of students with blond hair is 2e. The total number of students is ...

  3 + e + 2e -6 = 30

We subtracted 6 because the expressions e and 2e cause the 6 students with both blond hair and blue eyes to be counted twice.

  3e = 33 . . . . add 3 and simplify

  e = 11

11 students have blue eyes.

In the given problem, using the logical reasoning to deduce from the given facts, it can be determined that there are 10 students in Mrs. Taylor's class that have blue eyes.

To find out how many students in Mrs. Taylor's kindergarten class have blue eyes, we need to use the information given in the problem and make a series of logical deductions.

First, we know that there are twice as many students with blond hair as with blue eyes. Let's say the number of students with blue eyes is x. This implies that the number of students with blond hair is 2x.

We also know that there are 6 students with both blond hair and blue eyes. So, those students are included in both of our previous counts. Therefore, we need to subtract 6 from each count to get the number of students with only one of those attributes.

So far, this gives us x - 6 students with only blue eyes and 2x - 6 students with only blond hair. We know that there are 3 students with neither attribute, so the total number of students is (x - 6) + (2x - 6) + 6 (students with both attributes) + 3 (students with neither attribute) = 30.

Adding these together gives us 3x = 30, so x = 30/3 = 10. Therefore, there are 10 students with blue eyes.

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[tex](x - 17.7) + 19.6 = 27.8 \\ x - 17.7 = 27.8 - 19.6 \\ x - 17.7 = 8.2 \\ x = 17.7 + 8.2 \\ x = 25.9[/tex]

Answer:

She has 2 pieces left

Step-by-step explanation:

Answer:

2

Step-by-step explanation:

your welcome

Answer:

2:2,4,6,8,10,12,14,16

4:4,8,12,16

8:8,16

the LCM is 16

He had saved 320 initially

Step-by-step explanation:

Let the amount he saved be 'a'

Amount spent = 20 + 40 + 30

= 90

His grand father gave 50

At the end he has 280

280 = a - 90 +50

a = 280 -50 +90

= 320

He had saved 320 initially