A data set has a mean of 17 and consists of 4 numbers. If 3 of the numbers are 35, 11, 9, what is the remaining number?

Correct answer

C. 13

Explanation

Sum of all 4 numbers = mean × count = 17 × 4 = 68. Sum of the known numbers = 55. Remaining number = 68 - 55 = 13.

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