1. Knowing the meaning of random variables and discrete random variables will lead to some simple distribution lists of discrete random variables.
2. Understand the meaning of expectation and variance of discrete random variables, and work out the expectation and variance according to the distribution table of discrete random variables.
3. Common sampling methods, such as pump sampling, systematic sampling and stratified sampling, will be used to extract samples from the population.
4. Understand hypergeometric distribution and its derivation process, and can simply apply it.
5. Understand the concept of conditional probability and the independence of two events.