A data set has a mean of 15 and consists of 5 numbers. If 4 of the numbers are 18, 25, 6, 11, what is the remaining number?

Correct answer

A. 15

Explanation

Sum of all 5 numbers = mean × count = 15 × 5 = 75. Sum of the known numbers = 60. Remaining number = 75 - 60 = 15.

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