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Byju's Answer
Standard XII
Mathematics
Standard Deviation
The mean and ...
Question
The mean and S.D. of
1
,
2
,
3
,
4
,
5
,
6
is
A
3
,
3
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B
7
2
,
√
35
12
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C
7
2
,
√
3
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D
7
2
,
35
12
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Solution
The correct option is
B
7
2
,
√
35
12
¯
x
=
∑
x
i
n
=
1
+
2
+
3
+
4
+
5
+
6
6
=
7
2
σ
2
=
n
∑
i
=
1
x
2
i
n
−
¯
x
2
=
1
+
4
+
9
+
16
+
25
+
36
6
−
49
4
⇒
σ
2
=
35
12
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20
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.
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