Statistics · Mathematics · WB JEE

The mean and variance of a binomial distribution are 4 and 2 respectively. Then the probability of exactly two successes is

Mean of n observations x1, x2, ...., xn is $$\overline x $$. If an observation xq is replaced by xq' then the new mean is...

Standard deviation of n observations a1, a2, a3, ....., an is $$\sigma$$. Then, the standard deviation of the observations $$\lambda$$a1, $$\lambda$$a...