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Mathematics
Problem
In a frequency distribution, the following summary values are known:
N
=
40
N=40
N
=
40
,
∑
f
i
x
i
=
120
\sum f_i x_i=120
∑
f
i
x
i
=
120
, and
∑
f
i
x
i
2
=
460
\sum f_i x_i^2=460
∑
f
i
x
i
2
=
460
. What is the population variance of the data? a)
11.5
11.5
11.5
b)
2.56
2.56
2.56
c)
2.5
2.5
2.5
d)
1.58
1.58
1.58
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