Find Standard Deviation and Coefficient of Variation for grouped data
1. Calculate the mean and standard deviation for the following distribution
X
6
7
8
9
10
11
12
f
3
6
9
13
8
5
4
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2. Calculate the mean,.and standard deviation for the following distribution
Class
4.5-12.5
12.5-20.5
20.5-28.5
28.5-36.5
36.5-44.5
44.5-52.5
52.5-60.5
60.5-68.5
68.5-76.5
f
4
24
21
18
5
3
5
8
2
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3. Calculate the mean and standard deviation for the following distribution
x
18
19
20
21
22
23
24
25
26
27
f
3
7
11
14
18
17
13
8
5
4
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4. Calculate the mean and standard deviation for the following distribution
Class
50-55
45-50
40-45
35-40
30-35
35-30
20-25
f
25
30
40
45
80
110
170
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