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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READ  A student's mark was wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half 1/2. What is the number of students in the class?

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