Mean of the data x1 , x2, x3, x4 , x5 is 15. If each observation is multiplied 3 then the mean becomes
Mean of the data x1 , x2, x3, x4 , x5 is 15. If each observation is multiplied 3 then the mean becomes
A) 5
B) 45
C) 18
D) 12
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