Average Practice Test 4

Question : 31 of 40

Marks: +1, -0

16 children are to be divided into two groups A and B of 10 and 6 children. The average per cent marks obtained by the children of group A is 75 and the average per cent marks of all the 16 children is 76. What is the average per cent marks of children of group B?

$78 2 /3$
$78 1 /3$
$77 2/ 3$
$77 1 /3$

Validate

Solution:

The average per cent marks of children of group B

={16×76-10×75}/6

=466/6=77 2/3

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