Question

I dont know how to solve this please help me.
Q. Find the mean of the following distribution.
Marks obtained by 40 students in an exam are given below.
Marks 25,30,15,20,24
Number of students 8,12,10,6,4

Answer 1

The sum of all marks divided by the sum of the total number of students

114/40
2. 85

Answer 2

this is easy just *total the marks.*(fi)
multiply the *students by there marks.*(fixi)
then total (fixi) and divide it by (fi)

Ans = 8.12