Question

MEDAL
Class A of 20 students scored 60% while class B of 28 students undergoing the same test scored 70%. It was decided to put all marks together and find the common average

Answer 1

(x1 + x2 + .. + x20)/20 = 0.60
(x1+x2 + ...+x20) = 19.6

(y1 + .. + y28)/28 = .70
(y1 + .. + y28) = 8.4

(x1 + .. + x20 + y1 + .. + y28) / (20+28) = (12+19.6)/48 = 65.83%

Answer 2

oops I got a wrong number

Answer 3

20*.6 = 12
and 28 * .7 = 19.6

Answer 4

How did you get 19.6?

Answer 5

Ok I get

Answer 6

I corrected my numbers. The FINAL answer is right though

Answer 7

Thanks for your help champ