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###### A technician services mailing machines at companies in the Phoenix area: Depending on the type of malfunction, the service call take 1,2,3 or 4 hours: The different types of malfunctions occur at about the same frequency:Let x represent the number of hours the service call may take, the probability function f(3) is

A technician services mailing machines at companies in the Phoenix area: Depending on the type of malfunction, the service call take 1,2,3 or 4 hours: The different types of malfunctions occur at about the same frequency: Let x represent the number of hours the service call may take, the probability function f(3) is

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