Question

Mean of 6 numbers is 8,what should be added to it to make the mean 9?

Answer 1

First case. total sum =6×8=48
second case .total sum=7×9=63
therefore 15 should be added .

Answer 2

Mean of 6 numbers is 8

Sum of 6 numbers/6 = 8

Sum of 6 numbers = 8×6

Sum of 6 numbers = 48

what should be added to it to make the mean 9?

Let the number which should be added be x

(Sum of 6 numbers + x)/7 = 9

48+x = 63

x = 63-48

x = 15

Therefore,15 should be added to it to make the mean 9.

Hope it helps