2
4
12
17
Correct answer is A
7
8
9
10
11
13
-3
-2
-1
0
1
3
--------------
28
S.D = \(\frac{\sqrt\sum (x - x)^2}{N} = \frac{\sum d^2}{N} = \frac{\sqrt{28}}{7}\)
= \(\sqrt{4}\)
= 2
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