If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of

Question

If out of 10 selected students for an examination, 3 were of 20 years, age, 4 of 21 and 3 of 22 years, the average age of the group is

Options:

A . 21 years

B . 22 years

C . 20 years

D . 21.5 years

Answer: Option A
Answer: (a)Average age of the whole group = ${3 × 20 + 4 × 21+3 × 22}/10$= ${60 + 84 + 66}/10$ = $210/10$= 21 years

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