Mean or mathematical expectation of random variable

Variance of random variable

Obtain mathematical expectation and variance of the discrete random variable X which denotes the minimum of two numbers that appear when a pair of fair dice is tossed once.

Discrete random variable

A random variable X has the following probability distribution: Find the expectation of the random variable X.

Mean of a discrete random variable

Find the expected value ,variance and standard deviation of random variable X whose probability mass function (p.m.f.) is given below.

If the probability density function of a continuous random variable X is f(x)={{:((3+2x)/(18),2lexle4),(0,xlt2" or"xgt4):} Then the mathematical expectation of X is

Find the expected value,variance and standard deviation of a random variable X whose pmf is given below.

Probability Distribution of Random variable

Geometrical probability || Mathematical expectation tree diagram based