The mean of 40 items is 35 and if each item is multiplied by ‘a’ then the new mean will be

(A) 35 a (B) 35 + a C) 40 D) 40 + a

Let us consider this property of mean:

If is themean of , then the mean of is , where *a* is any number different from zero i.e. if each observation is multiplied by a non-zero number *a*, then the mean is also multiplied by *a.*

Thus, if the mean of 40 numbers is 35 and if each observation is multiplied by *a*, by the above property, the new mean is 35*a*

Hence the correct option is A.

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