A data set has a mean of 15 and consists of 4 numbers. If 3 of the numbers are 8, 28, 7, what is the remaining number?

Correct answer

A. 17

Explanation

Sum of all 4 numbers = mean × count = 15 × 4 = 60. Sum of the known numbers = 43. Remaining number = 60 - 43 = 17.

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