# Probability distributions

This section introduces the concept of a random variable and probability distributions that have certain characteristics. The Binomial and Normal distributions are covered in detail

The videos are from Professor Leonard on Youtube. Professor Leonard's videos are detailed, which makes them longer to watch. Settle down with a cup of tea.

**A Study of Probability Distributions, Mean, and Standard Deviation [length: 1h:12m:42s]**This video introduces discrete and continuous random variables along with the mean and standard deviation of a random variable.

**The binomial distribution [length: 1h:32m:29s]**This video introduces the binomial distribution and how to calculate binomial probabilities, using both the formula and using probability tables.

**The mean and standard deviation of a binomial random variable [length: 42m:19s]**This video explains how to calculate the mean and standard deviation of a binomial random variable.

**Normal distribution [length: 2h:11m:14s]**This video introduces continuous random variables and the normal distribution. The bell shaped curve and standard normal calculations - converting from X to Z.

**Applications of the normal distribution [length: 56m:34s]**This video explains how to calculate probabilities using the Z score and using probability tables.

**Using Sampling distributions to approximate populations [length: 50m:20s]**This video introduces the idea of using a sample as an approximation of a population.