A data set has a mean of 28 and consists of 4 numbers. If 3 of the numbers are 30, 15, 21, what is the remaining number?

Correct answer

B. 46

Explanation

Sum of all 4 numbers = mean × count = 28 × 4 = 112. Sum of the known numbers = 66. Remaining number = 112 - 66 = 46.

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