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GRE

A data set has a mean of 16 and consists of 5 numbers. If 4 of the numbers are 18, 12, 14, 13, what is the remaining number?

Correct answer

A. 23

Explanation

Sum of all 5 numbers = mean × count = 16 × 5 = 80. Sum of the known numbers = 57. Remaining number = 80 - 57 = 23.

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