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KVPY Sample Paper KVPY Stream-SX Model Paper-19

  • question_answer
    The mean of 63 children on an arithmetic test are respectively 27.6 and 7.1. To them are added a new group of 26 who had less training and whose mean is 19.2 and S.D. 6.2. The value of the combined group differ from the original as to the mean is

    A) 25.1

    B) 2.3  

    C) 1.5

    D) 2.5

    Correct Answer: D

    Solution :

    Mean of the combined group are
    \[M=\frac{63\times 27.6+26\times 19.2}{63+26}=25.1\]
    Thus A.M. is decreased by \[27.6-25.1=2.5\]


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