the average mark of a class of thirty two students is 75 . if 3 students whose marks are 28 and 34 are removed , then find the approximate average mark of the remaining students of the class .  Choices
A) 71
B) 74
C) 78
D) 70
E) 80

Rationale: exp . total mark of 32 students = 75 * 32 = 2400 , total mark after the removal of 2 students = 2400 – ( 28 + 34 ) = 2400 – 62 = 2338 approximate average mark = 2338 / ( 32 - 2 ) = 2338 / 30 = 78 answer : c
Answer: C