Question

IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x- score that corresponds to a z-score of 2.33.

Answer 1

Z = (score-mean)/SD

2.33 = (x-100)/15

Solve for x.

Answer 2

143.2

Answer 3

134.95

Answer 4

x=mean+score * SD
x=100+2.33*15=134.95
so x=134.95