In an examination average marks obtained by the girls of a class is 75 and the average marks obtained by the boys of the same class is 72 . If the girls and boys are in the ratio 3 : 4 , average marks of the whole class (approx.) is:
Answer & explanation
Correct answer: option 3
Ratio of Boys Girls
4 : 3 = 7 ( sum of number of boys and girls )
Average of 72 75
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Total = 72 × 4 75 × 3
Total = 288 225
Average (combined) = \(\frac{288+ 225}{7}\) = 73.2 ( approx )