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Railways Sample Paper RRB (Group D) Sample Test Paper-12

  • question_answer
    Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is

    A)  1 m 12 cm       

    B)  1 m 12.1 cm

    C)  1 m 21.1 cm    

    D)  1 m 21 cm

    Correct Answer: B

    Solution :

    [b] Average height = \[\frac{6\times (1.15)+8\times (1.10)+6(1.12)}{20}\] \[\Rightarrow \frac{22.42}{20}=1.121\,\,or\,\,1\,\,m\,12.1\,\,cm\]


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