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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.​
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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.​

User Umang Patwa
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1 Answer

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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:

User Arfeen
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