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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The mean of 30 girls = 73
The total students = 50
Out of the 30 are girls than the total no. of boys are 50-30 = 20
The score of girls = 73*30 = 2190
The score of boys = 71*20 = 1420
The mean score of whole class = 2190+1420/50
3610/50
361/5
722/10
= 72.2
The mean of whole class = 72.2
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