Q. 13

If each observation of a data is increased by 5, then their mean
A. remains the same

B. becomes 5 times the original mean

C. is decreased by 5

D. is increased by 5

Answer :

Let the observations be x1, x2, x3.........xn

Mean = .....(i)

If each observation is increased by 5, we get,

x1 + 5, x2 + 5, x3 + 5.........xn + 5

New mean

Mean =

Thus, the mean is also increased by 5.

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