A) 22 years
B) 21 years
C) 21.5 years
D) 20 years
Correct Answer: B
Solution :
Average age of the whole group \[=\frac{3\times 20+4\times 21+3\times 22}{10}\] \[=\frac{60+84+66}{10}=\frac{210}{10}\] = 21 yearsYou need to login to perform this action.
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