9FA3 - Econ. 180. Assignment 3. Probability Distributions...

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Econ. 180. Assignment 3. Probability Distributions for Discrete Random Variables. D1. A random variable (r.v.) is a variable that assumes numerical values associated with the random outcomes of an experiment , where one (and only one) numerical value is assigned to each sample point . D2 . Discrete random variable : r.v. that can be assumed a countable number of values. D3 . The probability distribution of a discrete r.v . is a graph , table , or formula that specifies the probability associated with each possible value the r.v. can assume. Requirements: Let x = discrete r.v. 1. p(x) ≥ 0 for all values of x. 2. Σp(x) = 1. where the summation (Σ) of p(x) is over all possible value of x. Note: The probability distribution for a random variable is a theoretical model for the relative frequency distribution of population. Thus the probability distribution of x can be described by a mean (μ) and a variance (σ 2 ). D4
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This note was uploaded on 09/08/2010 for the course AAS 180 at San Jose State University .

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9FA3 - Econ. 180. Assignment 3. Probability Distributions...

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