NDA 2017 Mathematics question

Given that the arithmetic mean and standard deviation of a sample of 15 observations are 24 and 0 respectively. Then which one of the following is the arithmetic mean of the smallest five observations in the data?

(A)0
(B)8
(C)16
(D)24Correct

Answer: (D)

Solution

A standard deviation of 0 means every observation equals the mean, i.e. all 15

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Question ID VK-028797