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UPSC NDA Math Model Paper 8
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© examsnet.com
Question : 54
Total: 120
What is the mean deviation of the data 2, 9, 9, 3, 6, 9, 4 ?
2.23
2.57
3.23
3.57
Validate
Solution:
Given data is 2, 9, 9, 3, 6, 9, 4
⇒ n = 7
Mean
x
=
2
+
9
+
9
+
3
+
6
+
9
+
4
7
⇒
x
=
6
Mean deviation
=
1
n
∑
|
x
−
x
|
⇒ Mean deviation =
1
7
(
|
2
−
6
|
+
|
9
−
6
|
+
|
9
−
6
|
+
|
3
−
6
|
+
|
6
−
6
|
+
|
9
−
6
+
|
4
−
6
|
)
⇒ Mean deviation = 2.57
Hence, the mean deviation of the data 2, 9, 9, 3, 6, 9, 4 is 2.57
© examsnet.com
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