Unit 6b-1

Unit 6b-1 - Discrete Distributions Random Variable Random A...

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Discrete Distributions
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Random Variable - Random Variable - A numerical variable whose value depends on the outcome of a chance experiment
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Two types: Two types: Discrete – count of some random variable Continuous – measure of some random variable
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Discrete Probability Distribution Discrete Probability Distribution Gives the values associated with each  possible x value Usually displayed in a table, but can be  displayed with a histogram or formula
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Properties for a discrete Properties for a discrete probability distribution probability distribution 1) For every possible x value,  0 <  P(x) <  1. 2) For all values of x,  Σ  P(x) = 1.
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Suppose you toss 3 coins & record the number of  Suppose you toss 3 coins & record the number of  heads. heads. The random variable X defined as . .. Create a probability distribution. Create a probability histogram.
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Unit 6b-1 - Discrete Distributions Random Variable Random A...

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