Question

the mean of 75numbers is 35 if each number is multiply by 4 find the new mean.... solve.

Answer 1

3Mean of 75 numbers = 35

Sum of all numbers = Average X Total no. of addends = 35 X 75 = 2625

If 4 is added to each number then, the sum will increase 4 times.

= 2625 X 4 = 10500

New mean = Sum of all addends / No. of addends = 10500 / 75 = 140

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Answer 2

Mean of 75 numbers = 35
If each observation is multiplied by k then the mean becomes k times the original mean.
Since each observation is multiplied by 4 then the new mean = 4 × 35 = 140