30 आइटम (items) का परिणाम देखा गया, इनमें से | vedclass

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Question

Variance remains some if same number is subracted from  each observation. (subtract $10$ from each observation)

$	herefore \frac{{1{{\left( {

Vedclass · Accepted Answer

$\sqrt 2$

Vedclass · Answer

Variance remains some if same number is subracted from  each observation. (subtract $10$ from each observation)

$	herefore \frac{{1{{\left( { - d} ight)}^2} + 10{{\left( 0 ight)}^2} + 10{{\left( d ight)}^2}}}{{30}} - {\left( {\frac{{10\left( { - d} ight) + 10\left( 0 ight) + 10\left( d ight)}}{{30}}} ight)^2} = \frac{4}{3}$

$\frac{{20{d^2}}}{{30}} = \frac{4}{3}$

$ \Rightarrow {d^2} = 2$

$\left( d ight) = \sqrt 2 $

$x_i$	$2$	$4$	$6$	$8$	$10$	$12$	$14$	$16$
$f_i$	$4$	$4$	$\alpha$	$15$	$8$	$\beta$	$4$	$5$

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