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 35a
Hence the correct option is A.