This is part of a free course in Undergraduate Probability: https://www.math.uci.edu/~rvershyn/teaching/ugp/ugp.html
0:00 Probability is a measure of belief, it can change based on evidence.
0:55 Example: a cancer & smoking study
4:55 Definition of conditional probability
6:08 Example: probability that both children are girls if the older is a girl
8:55 Example: probability that both children are girls if at least one child is a girl
10:07 Example: a survival probability
12:56 Example: probability of renting a Netflix movie
15:03 A multiplication rule, or a "chain rule"