Statistics Test...

The standard deviation $$\sigma$$ of the first $$N$$ natural numbers can be obtained using which one of the following formula?

Mean deviation of the series $$a,a+d,a+2d,......,a+2nd$$ from its mean is

The standard deviation of the data:
$$x:$$ $$1$$  $$a$$  $${a}^{2}$$........$${a}^{n}$$
$$f:$$  $${ _{  }^{ n }{ C } }_{ 0 }$$  $${ _{  }^{ n }{ C } }_{ 1 }$$.....$${ _{  }^{ n }{ C } }_{ n }$$ is

Standard deviation of the first $$2$$n + $$1$$ natural numbers is 

Variance of $$^{10}C_{0}, ^{10}C_{1}, ^{10}C_{2},^{10}C_{10}$$ is:

If the sum of mean and variance of $$B.D$$ for $$5$$ trials is $$1.8$$, the binomial distribution is 

What is standard deviation of the set of observations $$32,28,29,30,31$$?

The scores of a batsman in ten innings are: $$38, 70, 48, 34, 42, 55, 63, 46, 54, 44$$. Find the mean deviation about median.

Which of the following show direct variation?

Find the range in the following frequency distribution of economics marks.