Question

There are 60 students in a class. The following is the frequency distribution of marks obtained
by the students in a test:
Marks
0
1
2
3
4
5
Frequency X-2
x
x2
(X+1)2
2x
x+1
Where, x is a positive integer. Determine the mean and Standard deviation of the marks.​

Answer 1

There are 60 students in a class. The following is the frequency distribution of marks obtained

by the students in a test:

Marks

0

1

2

3

4

5

Answer :- Mean = 0+1+2+3+4+5/6

= 15/6

= 2.5