if the mean marks of three groups of 8,10 and 12 students respectively is 50,55 and 60 then the mean marks of all the students is:
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Sum of 1st group= 8*50
=400
Sum of 2nd group=10*55
=550
Sum of 3rd group=12*60
=720
Mean = Sum of observations/No. of observations
=400+550+720/30
=1670/30
167/3 or 55.67
=400
Sum of 2nd group=10*55
=550
Sum of 3rd group=12*60
=720
Mean = Sum of observations/No. of observations
=400+550+720/30
=1670/30
167/3 or 55.67
YashiRastogi:
no the answer is 55 right 2/3
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