Question

If ∑fi =20 , ∑fixi =140 and = 9 find their algebraic sum​

Answer 1

Correct option is

A

5

Given ∑f

i

x

i

=75 and

∑f

i

=15

Mean(

x

)=

∑f

i

∑f

i

x

i

=

15

75

=5

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