Question

I dunno how to solve this task, and could pls tell me how to find 10% in Z score table, i dont get it how to find it????

Answer 1

Below

Explanation:

Median = 500 S.D. = 100

A) Look at + z-score table for .85

z-score = +1.04

you have to be 1.04 S.D. 's to be at 85 th percentile

500 + 1.04 * 100 = 604

B) 500 is in the middle (50%) you need to go UP 40 % and down 40%

so look for + z score = .900 and - z-score = .100

z score : = 1.28 = - 1.28

500 + 1.28 * 100 = 628 500 - 1.28 * 100 = 372

so the range of scores would be 372 - 628