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Discussion :: Average

  1. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:

    2. A.

    53.33
    B.

    54.68
    C.

    55
    D.

    None of these

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    Answer : Option B

    Explanation :

    Required average = \( [\frac { 55*50+60*55=45*60 } { 55+60+45 } ]\)

                                 

                               = \(\frac { 2750 +330+2700} { 160 } \)

                       

                               = \(\frac { 8750 } { 160 } \)  

                             

                               = 54.68

     

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