NDA 2025 Mathematics question

The standard deviation of 100 observations is 10. If 5 is added to each observation and then divided by 20, then what will be the new standard deviation?

(A)0.25
(B)0.5Correct
(C)0.75
(D)1.00

Answer: (B)

Solution

Standard deviation is unaffected by a change of origin (adding 5) but is divided by the

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Question ID VK-030125