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SSC Sample Paper Mock Test-19 SSC CGL Tear-II Paper-1

  • question_answer
    The average of a collection of 20 measurements was calculated to be 56 cm. But later it was found that a mistake had occurred in one of the measurements which was recorded as 64 cm, but should have been 61 cm. The correct average must be   

    A)     53 cm

    B)  54.53 cm          

    C)  55.85 cm

    D)  56.15 cm

    Correct Answer: C

    Solution :

    Total length of 20 measurements \[56\times 20=1120\,\,\text{cm}\] Correct length of 20 measurements \[=1120-64+61=1117\] Correct average \[=\frac{1117}{20}=55.85\,\,\text{cm}\]


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