Question

the average of 10 numbers is 7 if each number is multiplied by 12 then the average of the new set of the numbers is

Answer 1

1st METHOD

Average of 10 numbers = 7
Sum of 10 numbers = 7*10 = 70

Sum of  New set of Nos = 70*12 = 840 (since each No is multiplied by 12)

Average of New set of Nos10 Nos = 840/10 = 84


2nd METHOD

Since each number is multiplied by 12, the average will also get multiplied by 12
Avg of new set of numbers = 7*12 = 84