Discussion

Question:

In an examination, the average marks of 7 children was 20, that of 3 children was 45, that of another 4 children was 15 and that of 2 children was 0. What is the average marks of all the 16 children?

(Correct to one decimal place)

Explanation:

Average of all 16 children = $\frac{7 \times 20 + 3 \times 45 + 4 \times 15 + 2 \times 0}{7 + 3 + 4 + 2}$ = $\frac{335}{16}$ = 20.9

Hence, option (b).

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