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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Statistics
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In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?

$\begin {array} {1 1} (A)\;73 & \quad (B)\;65 \\ (C)\;68 & \quad (D)\;74 \end {array}$

Can you answer this question?
 
 

1 Answer

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Total student = 100
For 70 students total marks = $ 75 \times 70$
$ = 5250$
Total marks of girls = & 7200-5250$
$ = 1950$
Average of girls = $ \large\frac{1950}{30}$
$ = 65$
Ans (B)
answered Jan 26, 2014 by thanvigandhi_1
 

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