EPFO 2015 English Medium Solved Paper

Question : 81 of 120

Marks: +1, -0

There are 20 girls and 30 boys in a class, and their respective average marks are found to be 55 and 58.
The average marks of the entire class are

Solution:

Total marks of girls
= average x number of girls
=

55×20 = 1100

Total marks of boys = 58 x 30 = 1740
Hence, required average
Hence, required average
=

{\Total \marks \of \girls \and \boys }/{\Total \number\of \girls \and \boys}

={1100+1740}/{20+30}

=2840/50=56.8

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