Two dice are to be rolled. Random Variables Real Valued Function defined from the Sample Space. Random Variables can be discrete or continuous. Tossing two coins simultaneously. Tossing two fair coins simultaneously.
Random variables have a probability attached to it.
All possible values of the random variable and its corresponding probabilities. Sometimes these are represented by graphs. Binomial random Variable Very commonly used discrete random variable. The type of watch bought by the next 5 customers is noted.