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Byju's Answer
Standard XI
Statistics
Step Deviation Method
Find out quar...
Question
Find out quartile deviation and the coefficient of quartile deviation of the following series.
Wages of 9 workers in Rupees:
170, 82, 110, 100, 150, 150, 200, 116, 250
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Solution
Arranging the data in the ascending order as presented below.
82, 100, 110, 116, 150, 150, 170, 200, 250
Here, N = 9
Q
1
=
size
of
9
+
1
4
t
h
=
size
of
2
.
5
th
item
=
size
of
2
n
d
item
+
0
.
5
size
of
3
r
d
item
-
size
of
2
n
d
item
=
100
+
0
.
5
110
-
100
=
105
Q
3
=
size
of
3
9
+
1
4
t
h
item
=
size
of
7
.
5
th
item
=
size
of
7
t
h
item
+
0
.
5
size
of
8
t
h
item
-
size
of
7
th
item
=
170
+
0
.
5
200
-
170
=
185
Q
.
D
.
=
Q
3
-
Q
1
2
=
185
-
105
2
=
40
Coefficient
of
Q
.
D
.
=
Q
3
-
Q
1
Q
3
+
Q
1
=
185
-
105
185
+
105
=
0
.
276
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