Find the standard deviation of the following group of numbers (use n – 1 instead of n)…2, 5, 8, 9
6
3.14
2.74
3.16
Solution :
n = 4
=
= (2 + 5 + 8 + 9) / 4 = 24 / 4 = 6
s =
(x
-
)2 / n -
1
=
[ (2 - 6)2 +(5 - 6) 2 + (8 - 6)2
+ (9 - 6)2 / 4 - 1 ]
= 3.16
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