2
4
12
17
Correct answer is A
x | x - x | (x - x)2 |
7 8 9 10 11 12 13
|
-3 -2 -1 0 1 2 3
|
9 4 1 1 0 4 9 -------------- 28
|
S.D = √∑(x−x)2N=∑d2N=√287
= √4
= 2
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