Question

Provide an approj riate response 6) Assume that adults have 1Q scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as o (somew the Wechsler test). Find the probability that a randomly selected adult has an IQ between 90 and 120 sere in the range of normal to bright normal). Draw a picture. Use Table A-2 or calculator 9 1O0 130 -7) (Same i ro from #6) Find the IQ score separating the top 16% from the others. Draw a picture. Use Table A-2 or calcu ator

Answer 1

6)

Solution:

7) Solution:

Given area 0.16
A = 1-0.16 = 0.84
Z0.84 = -0.99
X = μ + zσ
= 100 + (-0.99)(15)
= 85.15