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86 Suppose that the length of long distance phone calls measured in minutes is known...

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86 Suppose that the length of long distance phone calls measured in minutes is known to have an exponential distribution with the average length of a call equal to eight minutes a Define the random variable X b Is X continuous or discrete c X d e d f Draw a graph of the probability distribution Label the axes g Find the probability that a phone call lasts less than nine minutes h Find the probability that a phone call lasts more than nine minutes i Find the probability that a phone call lasts between seven and nine minutes nother on average what would you expect the total to be Why

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