For given data $N=60, \sum X^2=18000$ and $\sum X=960$,then variance of data is

From the prices of shares $X$ and $Y$ below,find out which is more stable in value:

$X$	$35$	$54$	$52$	$53$	$56$	$58$	$52$	$50$	$51$	$49$
$Y$	$108$	$107$	$105$	$105$	$106$	$107$	$104$	$103$	$104$	$101$

The variance of the variates $112, 116, 120, 125, 132$ about their $A.M.$ is

The variance of the first $10$ natural numbers which are multiples of $3$ is

The arithmetic mean of marks in Mathematics for four divisions $A, B, C$ and $D$ were $80, 75, 70$ and $72$ respectively. Their standard deviations were $12, 6, 8$ and $10$ respectively. Then,which division has more uniformity?

The variance of $20$ observations is $5$. If each of the observations is multiplied by $2$,then the variance of the resulting observations is: