The cumulative distribution function of the length of time, in minutes, that a customer queues in a Post Office is given by: if x < 0 if 0 ≤ x ≤9 1458 1 if x > 9 The probability that a customer will queue for longer than 5 minutes is equal to: O 0.252 O 0.672 O 0.312 O 0.771 F(x)= = 0 x 6 x3

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