Find the mean, variance and standard deviation using short cut method:

Two cards are drawn simultaneously (or successively without replacement) from a well shuffled pack of 52 cards. Find the mean, variance and standard deviation of the number of kings.

Calculate the mean, variance and standard deviation for the following distribution :

Calcuate the mean, variance and standard deviation of number of heads in two tosses of a coin.

Find the variance and standard deviation for the following data :

In the study of 79 diabetic patients, the following data are obtained. Find the variance and the standard deviation without finding the average (i.e. using deviation method).

Find the mean and standard deviation for the following data :

Find the mean and standard deviation for the following data :

Find the mean and standard deviation for the following data :

Find the mean and standard deviation for the following data :