Question

Fan & medal for one question

Scores on a test have a mean of 66 and Q3 is 80. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth.

10.5
18.7
20.9
9.4

Answer 1

mm hard one what do u think?

Answer 2

I honestly have no idea how to solve this, and help would be greatly appreciated.

Answer 3

mm idk rly but i might know someone who does one sec @DarkMoonZ

Answer 4

;-;

Answer 5

I don't know it either, sorry.

Answer 6

Q1 is prob. 51. The diff between 81 and 66 is 15. Subtract 15 from 66, you get 51. The average (or mean) is 66. => (51+81)/2=66.
this is a start, if it helps

Answer 7

It's 80, not 81....

Answer 8

The answer was 20.9

Answer 9

sorry:'(