Statistics Test...

For a collection of $$11$$ items, sum of all items is $$132$$, then the arithmetic mean is.

If the mean of the numbers $$a,b,8,5,10$$ is $$6$$ and their variance is $$68$$, then $$ab$$ is equal to

If the median of the data 6,7,x-2,x,18,21 written in ascending order is 16, then the variance of that data is 

The runs scored by Virat in 7 different matches are given as:

                 $$89,91,54,66,13,97,06$$

Calculate the mean deviation about the median for this data.

The mean deviation from the mean for the set of observations $$-1,0,4$$ is 

If the variance of $$1, 2, 3, 4, 5, ..., x$$ is $$10$$, then the value of $$x$$ is

If $$\displaystyle \sum_{i = 1}^9 (x_i - 5) = 9$$ and $$\displaystyle \sum_{i = 1}^9 (x_i - 5)^2 = 45$$, then the standard deviation of the 9 times $$x_1, x_2, ....., x_9$$ is

The arithmetic mean of the observations 10,8,5,a,b is 6 and their variance 6.8. Then ab=

The variance of first '$$n$$' natural number is

Mean of $$10$$ observations is $$50$$ and their standard deviation is $$10$$. If each observation is subtracted by $$5$$ and then divided by $$4$$, then the new mean and standard deviation are