Chapter 5 Discrete Random Variables Random Variable ? numeric variable whose value depends on a chance and is determined by the outcome of an experiment. The number, x, of TV sets in a sample of 8 five-year-old sets that have not needed a single repair. Here x could be 0, 1, 2, 3, 4, 5, 6, 7 or 8. The rating, x, on a 1 through 5 scale given to a song by a listener in an music survey. Here x could be 1, 2, 3, 4, 5 The number, x, of major fires in CA during the last two weeks. Here x could be 0, 1, 2, and so on. (no definite max number here) The number, x , of miles driven on a car that is serviced in the Oxford body shop. Here x could be from 0 and up, without any limit. Discrete Random variable ? random variable whose values form a finite set that can be listed. - How many siblings do you have? Probability Distribution for a discrete random variable ? table, graph, or formula that gives the probability associated with each possible value that the random variable can assume. Expected value (mean) of a Discrete Random Variable
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