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Finding the value of percentile 90 for the given mean and third quartile

Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is about normal. Find P90. (You will need to first find the standard deviation.)

a. 88.8
b. 88.3
c. 87.1
d. 87.6

Statistics and Probability, Statistics

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