Practice Test Discussion

Q)

Average of 40 observations is 50 and average of another 60 observations is 55. The average of all observations is ?

    • Explanation

    Sum ofo 40 observations = 40×50=2000

    and sum of 60 observations =60×55=3300

    ∴ Sum of 100 observations =2000+3300

     =5300

    Required average =5300100=53

    Hence, Option A is correct.

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