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26. Statistics question bank (Mathematics)

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Q1.

If the mean and standard deviation ($S$.$D$.) of the data $3, 5, 7, a, b$ are $5$ and $2$ respectively,then $a$ and $b$ are the roots of the equation:

(A)

$x^2-10x+18=0$

(B)

$2x^2-20x+19=0$

(C)

$x^2-10x+19=0$

(D)

$x^2-20x+18=0$

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Q2.

The mean of five observations is $4$ and their variance is $5.2$. If three of these observations are $1, 2$ and $6$,then the other two are

(A)

$2$ and $9$

(B)

$3$ and $8$

(C)

$4$ and $7$

(D)

$5$ and $6$

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