Statistics Test...

The variance of first $$ 50$$ even natural numbers is

The mean of $$x, y, z$$ is $$y$$, then $$x+z =$$

Value of the middle-most observation(s) is called:

The ________ is the difference between the greatest and the least value of the variate.

The modal value is the value of the variate which divides the total frequency into two equal parts.

Median divides the total frequency into _____ equal parts.

The difference between the maximum and the minimum obervations in data is called the ____________.

The variance is the _______ of the standard deviation.

State true or false:

Median of $$15, 28, 72, 56, 44, 32, 31, 43\ and\ 51\ is\ 43.$$