Question

jill had a list of 14 test scores for which she had calculated the mean. she then realized that she had forgotten to add in the bonus, which everyone got correct, so she added five points to all the grades. what happened to the mean?

a) the mean fell 5 points
b) the mean rose 5 points
c) it cannot be determined
d) the mean stayed the same

Answer 1

Answer:

b) the mean rose 5 points

Step-by-step explanation:

If you take these grades for example

95, 85, 92, 91, 96, 87, 92, 94, 98, 89, 88, 95, 91,84

and add them to get 1277, with a mean of 91  (1277 divided by 14)

then add 5 points to each of them to get

100, 90, 97, 96, 101, 92, 97, 99, 103, 94, 93, 100, 96, 89

and add them to get 1347, with a mean of 96  (1347 divided by 14)

You can see that the mean rose 5 points

I hope this helps.

Answer 2

Answer:

B

Step-by-step explanation:

I just did it on usatestprep