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Railways Sample Paper RRB (Group D) Sample Test Paper-11

  • question_answer
    The average height of 8 students is 152 cm. Two more students of heights 144 cm and 155 cm join the group. What is the new average height?

    A)  151.5 cm         

    B)  152.5 cm

    C)  151 cm

    D)  150.5 cm

    Correct Answer: A

    Solution :

    [a] Total height of 8 students  \[=8\times 152\,\,cm=1216\,\,cm\] Total height of 10 students  \[=1216\,\,cm+144\,\,cm+155\,\,cm=1515\,\,cm\] New average\[=\frac{1515}{10}\,\,cm=151.5\,\,cm\]


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