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Mathematics 8 Online
OpenStudy (anonymous):

The number of accidents at an intersection was recorded weekly for a year. There were 11 weeks with no accidents, 26 weeks with one accident, 13 weeks with two accidents, and 2 weeks with three accidents. The number of accidents in a randomly selected week is the random variable X. Find the probability density function for X, then E(X) and Var(X).

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