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Railways Sample Paper RRB (Group D) Sample Test Paper-2

  • question_answer
    The average of 13 results is 70. The average of first seven is 65 and that of the last seven is 75, the seventh result is:

    A)  70                               

    B)  70.5

    C)  68                   

    D)  67

    Correct Answer: A

    Solution :

    [a] Sum of 13 results\[=13\times 70=910\] Sum of 7 results \[=7\times 65=455\] Sum of last 7 results \[=7\times 75=525\] So, \[{{7}^{th}}\]result \[(455+525)-\,910=70\]


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