Question
A class has 20 boys and 15 girls. The average marks of boys is 68 and of girls is 72. Find the approximate average marks of the whole class.
Solution
Total marks of boys = 20 × 68 = 1,360 Total marks of girls = 15 × 72 = 1,080 Combined total = 1,360 + 1,080 = 2,440 Total students = 35 Average = 2,440 / 35 = 488/7 ≈ 69.71
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