Statistics Test...

Suppose for $$40$$ observations, the variance is $$50$$. If all the observations are increased by $$20$$, the variance of these increased observation will be

Variance of the first $$11$$ natural numbers is:

If a, b are constants then, $$Var(a+bX)$$ is

If $$X, Y $$ are independent then $$SD(X-Y)$$ is:

If the standard deviation of a population is $$9$$, the population variance is:

 If total sum of square is $$20$$ and sample variance is $$5$$ then total number of observations are

Find $$Var(2X+3)$$

If the standard deviation of a set of scores is $$1.2$$ and their mean is $$10$$, then the coefficient of variation of the scores is

Calculate the standard deviation of the first $$13$$ natural numbers.

If the variance of a data is $$12.25$$, then the standard deviation is