Arithmetic mean m`Dmwn
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Q No 1
Class Interval
Frequency
10
– 30 90
30
– 50 20
50
– 70 30
70
– 90 20
90
– 110 40
Q No 2 Class Interval 0 – 10
10 – 20 20 – 30 30 – 40 40 – 50
Frequency
12 16 6 7 9
Q No 3 The data on number of
patients attending a hospital in a month are given below.Find the average number
of patients attending the hospital in a day.
Number
of Patients
Number of days attending hospital
0
– 10 2
10
– 20
6
20
– 30
9
30
– 40 7
40
– 50 4
50
– 60 2
Q No 4 Calculate the Arithmetic mean of the following frequency
distribution.
Class
Interval Frequency
0
– 10 12
10
– 20 15
20
– 30
11
30
– 40
20
40
– 50 14
50
– 60 15
60
– 70 13
Q No 5 Find the mean of the following data:
Class Interval Frequency
50
– 60 8
60
– 70 6
70 – 80 12
80 – 90 11
90 – 100 13
Q No 6 Apply direct method to
find arithmetic mean in each of the following
Class interval
Frequency
0 – 6 7
6 – 12 5
12 – 18 10
18 – 24 12
24 – 30 6
Q No 7 Class Interval Frequency
0 – 10 8
10 – 20 10
20 – 30 9
30 – 40 12
40 – 50 11
Q No 8 Class Interval Frequency
0 – 8 5
8 – 16 9
16 – 24 10
24 – 32 8
32 – 40 8
Q No 9 Class
Interval 0 – 10 10
– 20 20 – 30 30 – 40 40 – 50
Frequency 5 6 4 3 2
Q No 10 Class Interval 100 – 120
120 – 140 40 – 160 160 – 180 180 – 200
Frequency 10 20 30 15 5
