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Mathematics
Mathematics
Problem
The marks (out of 10) obtained by five students have
∑
x
i
2
=
150
\sum x_{i}^{2}=150
∑
x
i
2
=
150
and
∑
x
i
=
25
\sum x_{i}=25
∑
x
i
=
25
. Find the variance of the marks. a)
6.25
6.25
6.25
b)
2.5
2.5
2.5
c)
5
5
5
d)
12.5
12.5
12.5
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