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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-9

  • question_answer
    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

    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 years


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