Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test) $\text { Find } P _ { 10 } \text {, which is the IQ }$ core separating the bottom 10% from the top 90%.
A) 80.8
B) 80.1
C) 81.9
D) 81.3

Question

Quizplus · Accepted Answer

The z-score corresponding to the bottom 10% is -1.28. So, the IQ score separating the bottom 10% from the top 90% is 100 + (-1.28)(15) = 80.8.

Assume That Adults Have IQ Scores That Are Normally Distributed Find P10, which is the IQ \text { Find } P _ { 10 } \text {, which is the IQ } Find P10​, which is the IQ

Assume That Adults Have IQ Scores That Are Normally Distributed $\text { Find } P _ { 10 } \text {, which is the IQ }$