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Railways Sample Paper RRB (Assistant Loco Pilot) 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)  \[1m\text{ }12cm\]                

    B)  \[1m\text{ }12.1\text{ }cm\]

    C)                    \[1m\,21.1cm\]        

    D)         \[1m\,\,21cm\]            

    Correct Answer: B

    Solution :

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


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