calculate the standard deviation for the following score 2, 4, 6, 8, 10
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Answer:
Variance
(
σ
2
)
is the average of squared difference from mean.
Mean is
M
=
2
+
4
+
6
+
8
+
10
5
=
30
5
=
6
Variance is
σ
2
=
(
2
−
6
)
2
+
(
4
−
6
)
2
+
(
6
−
6
)
2
+
(
8
−
6
)
2
+
(
10
−
6
)
2
5
=
16
+
4
+
0
+
16
+
4
5
=
40
5
=
8
So the variance is
8
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