Mean and Variance of the Sum of Random Variables | |
Summary |
two or more random variables can be combined together by either adding or subtracting. for adding two random variables the means and variances are added. for subtracting two random variables the means are subtracted but the variances are added. |
Key Skills |
solve problems involving the mean and variance of the sums and differences of random variables, including word problems and applications. |
Vocabulary |
standard deviation, variance, random variable, independent events |