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UPSC CDS Math Statistics Questions

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Question : 16

Total: 63

Let

) be the means of two sets comprising n1 and n2 (where n2 < n1) observations respectively. If x is the mean when they are pooled, then which one of the following is correct ?

−
x1
<
−
x
<
−
x2
−
x
>
−
x2
−
x
<
−
x1
(
−
x1
−
−
x
) + (
−
x2
−
−
x
) = 0

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