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UPSC NDA 2 2012 Mathematics Paper
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© examsnet.com
Question : 108
Total: 120
What is the standard deviation of
7
,
9
,
11
,
13
,
15
?
2.4
2.5
2.7
2.8
Validate
Solution:
S.D.
=
σ
=
√
1
n
Σ
(
x
−
x
)
2
=
√
1
n
[
16
+
4
+
4
+
16
]
=
√
40
5
=
√
8
=
2
√
2
=
2
×
1.4
=
2.8
© examsnet.com
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