A data set has a mean of 31 and consists of 4 numbers. If 3 of the numbers are 28, 27, 38, what is the remaining number?

Correct answer

B. 31

Explanation

Sum of all 4 numbers = mean × count = 31 × 4 = 124. Sum of the known numbers = 93. Remaining number = 124 - 93 = 31.

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