Let 'X' denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of 'X'.

Find the variance and standard deviation of 3,4,6,5,5,3,8,1,7,5 .

Find variance and standard deviation for the following data:

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

X is a random variable which denotes the number of heads obtained when a coin is tossed three times.Find mean and variance of the probability distribution.

Two dice are thrown. Let A be an event to get an even number on first die and B be an event to get sum of the numbers obtained on two dice is 8.Write the outcomes favorable to the event A, the event B.

Let a pair of dice be thrown and the random variable X be the sum of the numbers that appear on the two dice. Write the probability distribution of X.

Find the mean and variance of the number obtained on a throw of an unbiased die.

Marks obtained in mathematics examination are given below:(iii)Find standard deviation of marks

Two dice are rolled once. Let A be the event that the first die shows an odd number and B be the event that the sum of the numbers on the dice is 8. Find the probability that either the first die shows an odd number or the sum of numbers on the dice is 8.