Q.

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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a

65

b

60

c

66

d

62

answer is A.

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Detailed Solution

Mean mark of girls in the class was =  70×75+30×x100=72⇒x=65
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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