if n=20,summation of x=240, summation of x^2=3650,compute S.D. and C.V
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Answer:
=
n
∑x
2
−(
n
∑x
)
2
=
10
1530
−(12)
2
=
153−144
=
9
=3
Coefficient of variation =
x
σ
×100
=
12
3
×100
=
4
1
×100
=25
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