Deriving the Mean and Variance of a Continuous Probability Distribution

Mean and variance of Bernoulli distribution example | Probability and Statistics | Khan Academy

Find the Mean and Variance of a Random Variable Given the Probability Density Function

Expected Value and Variance of Discrete Random Variables

The expected value and variance of a linear function of a random variable

Find the Mean, Variance, and Standard Deviation Given the Probability Density Function

The Expected Value and Variance of Discrete Random Variables