Question

The accompanying table shows the scores on a classroom test. What is the population standard deviation? x: 100, 95,90,80,75, 72, 70 f: 7, 2, 10, 4, 2, 3, 4

Answer 1

ok, so first we find the average of the population

Answer 2

is it possible to do this on the calculator?

Answer 3

of course

Answer 4

is 10.74054817 correct?

Answer 5

no, i got 88,

Answer 6

ill show you why, its long tedious, but simple. bear with me

Answer 7

wait, did you get 10.74054817 for the average?

Answer 8

wait before you do all that can't you put it in the table on the calculator and then hit 1var stats and type in (L1,L2)

Answer 9

well its population standard deviation remember

Answer 10

yes, but you need to find the average of the population first. did you do that?

Answer 11

thats not the way we did it so im not sure how to do that..

Answer 12

find the average? you know. if we have 6,8,4 we find the average by
(6+8+4)/3= 6 so the average of this population is 6

Answer 13

ill do this in the calculator can you look at the other two please?

Answer 14

ok