REVISION
1. Find the mean of the following data.
(a) 9, 7, 11, 13, 2, 4, 5, 5
(b) 16, 18, 19, 21, 23, 23, 27, 29, 29, 35
Find the mean of the following distribution.
(a) The age of 20 boys in a locality is given below.
Age in Years
Number of Boys
12
5
10
3
15
2
14
6
8
4
(b) Marks obtained by 40 students in an exam are given below.
Marks
Number of Students
25
8
30
12
15
10
20
6
24
4
(c)
xi
fi
1
4
2
5
3
8
4
10
5
3
(d) The daily wages of 50 employees in an organization are given below:
Daily wages (in $)
Number of Workers
100 - 150
12
150 - 200
13
Find the mean daily wages.
Find the mode of the following data.
(a) 12, 8, 4, 8, 1, 8, 9, 11, 9, 10, 12, 8
(b) 15, 22, 17, 19, 22, 17, 29, 24, 17, 15
(c) 0, 3, 2, 1, 3, 5, 4, 3, 42, 1, 2, 0
200 - 250
17
250 - 300
8
(d) 1, 7, 2, 4, 5, 9, 8, 3
8. The runs scored in a cricket match by 11 players is as follows:
7, 16, 121, 51, 101, 81, 1, 16, 9, 11, 16
Find the mean, mode, median of this data.
Find the median of the following data.
(a) 27, 39, 49, 20, 21, 28, 38
(b) 10, 19, 54, 80, 15, 16
(c) 47, 41, 52, 43, 56, 35, 49, 55, 42
Find the missing number 28, ?, 9, 17, when average(mean) is 17 ?
Find the missing number 12, 18, ?, 5, when average(mean) is 13 ?
Find the missing number 15, 2, 10, ?, when average(mean) is 9 ?
Find the missing number 5, ?, 12, 12, when average(mean) is 10 ?