Weekly consumption | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 |
Number of families | 16 | 12 | 18 | 6 | 4 |
Answer:
Here,and
Using step deviation method
Mean (1)
(1/2)
(1)
Mean =19.7
Cl
Mid value
-25
0-10
10-20
20-30
30-40
40-50
5
15
25
35
45
16
12
18
6
4
-20
-10
0
10
20
-2
-1
0
1
2
-32
-12
0
6
8
N=56
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