SOLUTION: Suppose that IQ scores are normally disributed with means = 100 and standard deviation = 10. Find the 90th percentile of IQ scores (To nearest whole number)

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Question 383491: Suppose that IQ scores are normally disributed with means = 100 and standard deviation = 10.
Find the 90th percentile of IQ scores (To nearest whole number)


Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
P%28Z%3C=z%29+=+0.90 implies that z+=+1.285, approximately. Now z+=+%28X+-+mu%29%2Fsigma implies that X+=+sigma%2Az+%2B+mu+=+10%2A1.285+%2B+100+=+112.85. Rounded off to the nearest whole number, 113.