The expected property is that if x is a random variable and c is a constant, then E(CX)=CE(X). 2. If x and y are any two random variables, then E(X+Y)=E(X)+E(Y). 3. Let x and y be independent random variables, then E(XY)=E(X)E(Y). 4. let c be a constant, then e (c) = c

Definition of expectation

In probability theory and mathematical statistics, mathematicexpectation or mean, also known as expectation, is one of the most basic mathematical characteristics, and it is the probability that every possible result in an experiment is multiplied by the sum of its results. It reflects the average value of random variables. Expectation is to have hope for the future of things or people and wait for the railway to be completed and opened to traffic as soon as possible. Never let everyone down.