Let x_1^{-} and x_2^{-} (where x_2^{-} > x_1^{-}) be the means of two sets comprising n_1 and n_2 (where n_2

Correct Answer is : −x1 < −x < −x2

(x_1^{-}-x^{-}) + (x_2^{-}-x^{-}) = 0

UPSC CDS 2 2018 Math Paper

Question : 59 of 100

Marks: +1, -0

Let

−

and

−

(where

−

) 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 ?

[2018 CDS-II]

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

Validate

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