NDA 2019 Mathematics question

Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation, then what will be the new mean and new standard deviation respectively?

(A)50, 10
(B)50, 15
(C)55, 10Correct
(D)55, 15

Answer: (C)

Solution

Adding 5 to every observation increases the mean by 5 (to 55) but leaves

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Question ID VK-029167