A data set has a mean of 18 and consists of 6 numbers. If 5 of the numbers are 11, 6, 8, 25, 9, what is the remaining number?

Correct answer

D. 49

Explanation

Sum of all 6 numbers = mean × count = 18 × 6 = 108. Sum of the known numbers = 59. Remaining number = 108 - 59 = 49.

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