If the mean of a set of observation x1 ,...

If the mean of a set of observation `x_1 , x_2 , …….x_10 ` is 20 then the mean of `x_1 +4, x_2 +8, x_3+ 12, ………… x_10 +40 ` is

A

34

B

42

C

38

D

40

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The correct Answer is:

B

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