Statistics Test...

The coefficient of mean deviation from median of observations  $$40, 62, 54, 90, 68, 76$$  is

The arithmetic mean of first ten natural numbers is

The sum of the squares of deviation of 10 observations from their mean 50 is 250, then coefficient of variation is

The S.D. of the following freq. dist.

The mean of a dist. is $$4$$. if its coefficient of variation is $$58\%$$. Then the S.D. of the dist. is

The mean deviation from mean of observations 5, 10, 15, 20, ......85 is

The mean deviation of $$\displaystyle \frac{a+b}{2}\: \: and\: \: \frac{a-b}{2} $$ (where a and b >0) is?

Standard deviation of the distribution $$1, 3, 5,....., 13$$ will be

In the following table pass percentage of three schools from the year $$2001$$ to the year $$2006$$ are given. Which school students performance is more consistent?

The mean deviation of first 8 composite numbers is