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A bank operates both a drive-up facility and a walk-up window. On a randomly selected...

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A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X be the proportion of time that the drive-up facility is in use (at least one customer is being served or waiting to be served) and Y be the proportion of time that the walk- up window is in use. The joint PDF is What is the probability that neither window is busy more than one-quarter of the time?

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