Question

In a school 90 boys and 30 girls appeared in an examination.the mean marks of boys was found to be 45%, where as the mean of girls was 70%. Determine the average marks % of the school. Also write values.

Answer 1

Answer:

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Step-by-step explanation:

Total No. of boys ⇒ 90

Mean of boys scored ⇒ 45

Sum of boys scores, $B^{1}$ ⇒ 90 x 45 = 4050

Total No. of girls ⇒ 30

Mean of girls scored ⇒ 70

Sum of girls scores, ∑$G^{1}$ ⇒ 30 x 70 = 2100

Mean score of whole class = (∑$B^{1} + G^{1}$) / Total no. of Students

⇒ (4050 + 2100) / 90 + 30

⇒ 6150 / 120

⇒ 51.25%

Answer 2

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