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 1159210: 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! the z-score for the 85th percentile is 1.0364
z=(x-mean)/sd
1.0364=(x-520)/100
103.64=x-520
x=623.64 or 624
