A. 53.33
B. 54.68
C. 55.75
D. 56.68
Required average = [ (55 x 50) + (60 x 55) + (45 x 60) ] / ( 55 + 60 + 45 )
=> (2750 + 3300 + 2700) / 160
=> 8750/160
=> 54.68
A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is: