Question

A students mark was wrongly entered as 83 instead of 63. Due to that average marks for class got increased by half.What is the total number of students

Answer 1

Answer:

Total students x

entered as 83 for 63

excess 20

class average increase 1/2

20/x = 1/2

x =20x2=40

No. of students = 40. Ans

Answer 2

Answer:

Total marks decreased = 83-63 = 20

bcz of this 20 marks average increase by half ,

let total students x ,

20 = x*(1/2)

x = 40 students (Ans.)