1. (15 pts) A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X equal to the proportion
1. (15 pts) A bank operates both a drive-up facility and a walk-up window. On a randomly selected day, let X equal to 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 is the proportion of time that the walk-up window is in use. Then the set of possible values for (X, Y) is the rectangle D = {(x, y): 0
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