SOLUTION: Assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation 15. Find Upper P9, which is the IQ score separating t

Question 1044404: Assume that adults have IQ scores that are normally distributed with a mean of
105
and a standard deviation
15.
Find
Upper P9,
which is the IQ score separating the bottom
9%
from the top
91%.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Need to have the z-value for 0.09 probability
That is -1.34
z=(x-mu)/sd
-1.34=(x-105)/15
-20.1=x-105
x=84.9 or 85
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SOLUTION: Assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation 15. Find Upper P9&#8203;, which is the IQ score separating t