Average | Aptitude Question and answers

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:

A. 53.33

B. 54.68

C. 55

D. None of these

Solutions:

Required average      = (55 x 50 + 60 x 55 + 45 x 60 /  55 + 60 + 45)  =  2750 + 3300 + 2700 / 160  = 8750/160 = 54.68

Answer: B

 

 

 

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