SOLUTION: The distribution of scores on a standardized aptitude test is approximately normal with a mean of 520 and a standard deviation of 100 . What is the minimum score needed to be in th
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Question 1159214: The distribution of scores on a standardized aptitude test is approximately normal with a mean of 520 and a standard deviation of 100 . What is the minimum score needed to be in the top 15% on this test?
Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer. Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! inv norm for .85 or 85th percentile is z=1.036
z=(x-mean)/sd
1.036=(x-520)/100
103.6=x-520
x=623.6433 rounding to 624.
