The mean mark in statistics of 100 students in a class was 72. The mean mark of boys was 75, while their number was 70. The mean mark of girls in the class was

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The mean mark in statistics of 100 students in a class was 72. The mean mark of boys was 75, while their number was 70. The mean mark of girls in the class was

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Detailed Solution

Mean mark of girls in the class was = $\frac{70 \times 75 + 30 \times x}{100} = 72 \Rightarrow x = 65$

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