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Standard X
Mathematics
Step-Deviation Method of Finding Mean
Question
Find the mean number of leaves per tree using step deviation method.
10.4
11
12
13
A
10.4
B
11
C
12
D
13
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Solution
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Answer:-
Class interval width (i) = 4
No. of leaves
X
No. of trees
F
u
=
X
−
A
i
Fu
0-4
2
10
-1
-10
4-8
6 = A
20
0
-0
8-12
10
30
1
30
12-16
14
40
2
80
Σ
f
=
100
Σ
f
u
=
110
Mean =
A
+
Σ
f
u
Σ
f
=
6
+
110
100
×
4
=
6
+
4
=
10.4
10.4 leaves
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