The mean marks of 100 students in a class in | vedclass

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(C) Total number of students $N = 100$. Mean marks of all students $\bar{X} = 72$. Total marks of all students $= 100 	imes 72 = 7200$. Number of boy

Vedclass · Accepted Answer

$65$

Vedclass · Answer

(C) Total number of students $N = 100$. Mean marks of all students $\bar{X} = 72$. Total marks of all students $= 100 	imes 72 = 7200$. Number of boys $n_1 = 70$. Mean marks of boys $\bar{X}_1 = 75$. Total marks of boys $= 70 	imes 75 = 5250$. Number of girls $n_2 = 100 - 70 = 30$. Total marks of girls $= 7200 - 5250 = 1950$. Mean marks of girls $\bar{X}_2 = \frac{1950}{30} = 65$.

The mean marks of $100$ students in a class in mathematics is $72$. If the number of boys is $70$ and their mean marks is $75$,find the mean marks of the girls in the class.

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