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victus00 [196]
3 years ago
12

Help please with #3

Mathematics
1 answer:
Alenkasestr [34]3 years ago
6 0

Answer: x = 2a over b + c

Step-by-step explanation:

1. Multiply both sides by two. This cancels out 2 and turns a into 2a. It should look like 2a = bx + cx

2) Since both b and c have x’s, we turn it into (b + c)x

3. Then divide both sides by b+c to get 2a over b + c = x

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17e+18

Step-by-step explanation:

9e+4=-5e+14+13e

4e+4+14+13e

17e+4+14

17e+18

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Ella needs a canvas that's 15 inches on one side and has area of 150 sq. ft what's the length of the missing side
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In the Social Psychology course, you receive a score of 77 on the second exam. You are told that the standard deviation of the s
Darina [25.2K]

Answer:

a)  mean = u = 83

b) Your friend's score is 1.625 standard deviations below the mean

Step-by-step explanation:

Note:

- The correct question is as follows:

" In the Social Psychology course, you receive a score of 77 on the second exam. You are told that the standard deviation of the second exam is 8 and that your score is .75 standard deviations below the mean. "

Find:

a.What is the class mean of the second exam?

b.Your friend scored a 70 on the second exam. How many standard deviations below the mean is your friend’s score?

Solution:

- The class mean can be calculated by using the given data of your score being 0.75 standard deviation less than mean:

                               Your score = mean - 0.75*standard deviation.

- Plug in the values:

                                77 = mean - 0.75*8

                                mean = u = 83

- Now your friend has a score of 70 on second exam, using the above relation again we have:

                               Friend's score = mean - a*standard deviation.

Where, a is the constant to be found:

                               70 = 83 - a*8

                               a = (70 - 83 ) / -8

                              a = 1.625

- Your friend's score is 1.625 standard deviations below the mean

6 0
3 years ago
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