A data set has a mean of 18 and consists of 6 numbers. If 5 of the numbers are 14, 20, 7, 36, 28, what is the remaining number?

Correct answer

A. 3

Explanation

Sum of all 6 numbers = mean × count = 18 × 6 = 108. Sum of the known numbers = 105. Remaining number = 108 - 105 = 3.

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