A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X= the proportion of time that drive-up facility is in use (at least one customer is being served or...

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Extracted text: A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X= the proportion of time that drive-up facility is in use (at least one customer is being served or waling to be served) and Y= the proportion of time that the walk-up window is in use. Suppose that the joint probability density of X and Y is given below.. Find the probability that neither faclity is busy more than one quarter of the time. ,9) = 0sxs1,0sysi otherwise 0.011 0.145 0.717 0.891