a class consists of 50 students out of which 30 are girls, the mean marks scored by girls is 73 and is that of the boys is 71, find the mean score of whole class.
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Answered by
9
{(73*30)+(71*20)}/50
(2190+1420)/50
3610/50
72.2
(2190+1420)/50
3610/50
72.2
Answered by
15
no of girls = 30
no of boys =20
mean = total scoreed by all student /no of student
={ 30 × 73 + 20× 71 }/(30 +20)
=(2190 +1420)/50
=(3610)/50
=361/5
=72.2
no of boys =20
mean = total scoreed by all student /no of student
={ 30 × 73 + 20× 71 }/(30 +20)
=(2190 +1420)/50
=(3610)/50
=361/5
=72.2
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