Calculate standard deviations using step deviation method 10,25, 20, 15, 40, 30, 10,50
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Class inreval
Mid values (x
i
)
Frequency (f
i
)
d
i
=x
i
−A
u
i
=
h
d
i
F
i
u
i
0-10
5
4
-20
-2
-8
10-20
15
6
-10
-1
-6
20-30
25=A
10
0
0
0
30-40
35
20
10
1
20
40-50
45
10
20
2
20
N=50
Total=26
h=10,A=25,N=50,∑f
i
u
i
=26
Mean (
x
)=A+h[
N
1
∑f
i
u
i
]
put the values
Mean=30.2
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