UPSC 2014 CDS II Math Paper

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Question : 99 of 100

Marks: +1, -0

If xi′s are the midpoints of the class intervals of grouped data, fi′s are the corresponding frequencies and

−

x

is the mean, then what is Σfi(xi−

−

x

) equal to?

[2014 CDS-II]

0
-1
1
2

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