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Problem 21 (1988 AJHSME)

AJHSMENormal

From module Mean, Median, Mode, and Harmonic Mean

Problem

A fifth number, nn, is added to the set {3,6,9,10}\{3, 6, 9, 10\} to make the mean of the set of five numbers equal to its median. The number of possible values of nn is

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