Statistics Test...

Mean of 10 values is 32.6. If another values is included the mean becomes 31. The included value is 

The algebraic sum of the deviations of a set of value of a data from their mean is

Which of the following is not changed for the observations $$31, 48, 50, 60, 25, 8, 3x, 26, 32?$$ (where $$x$$ lies between $$10$$ and $$15$$)

The arithmetic mean of first five natural number is

If the standard deviation for the marks obtained by a student in monthly tests is 36 then the variance is

Consider the data: $$2, 3, 2, 4, 5, 6, 4, 2, 3, 3, 7, 8, 2, 2$$. The frequency of $$2$$ is _____

The difference between he maximum and the minimum observations in the data is

The range of the data 
25,18,20,22,16,6,17,12,30,32,10,19,8,11,20 is

The _____ is the value that appears most often in a set of data.

Mode of the distribution is that value of the variate for which the_____is_____