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The mean of a set of numbers is X¯. If each number is divided by 3, then the new mean is

a
b
X¯+3
c
3X¯
d
X¯3

detailed solution

Correct option is D

Let x1,x2,…,xn n be n numbers. Then X¯=1n∑i=1n xiIf each number is divided by 3, then the new mean, Y¯ is given byY¯=1n∑i=1n xi3=131n∑i=1n xi=X¯3

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