Question

The mean marks of a class was 70%. There are 30 students. 20 are boys the boys meen mark 62%. What is the mean mark for the girl.​

Answer 1

Answer: let g = sum of 10 girls scores. Overall mean for 30 students is 70%. (b+g)/30 = 70 {equation 1}. Mean for 20 boys is 62: b/20 = 62.

Explanation: