Answer question 29 Q.28. Calculate mean of the following data:
(2.27. Calculate arithmetic mean:
11-13
Marks (More than)
No. students
100
10
88
Values below
10
30
30
120
Q.29. Calculate missing frequency, if mean of the distribution is 28.
0—10
12
10-20
20-30
27
17
Q.30. Calculate mean from the information given below.
8-10
10
14-16
31
[ X = 28 marks)
140
[X = 25861
= 18]
17-19