A data set has a mean of 30 and consists of 5 numbers. If 4 of the numbers are 28, 40, 9, 22, what is the remaining number?

Correct answer

A. 51

Explanation

Sum of all 5 numbers = mean × count = 30 × 5 = 150. Sum of the known numbers = 99. Remaining number = 150 - 99 = 51.

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