Question: On average, a plane takes off or lands at O'Hare Airport in Chicago once every 45 seconds. Calculate (without resorting to a computer) the probability

On average, a plane takes off or lands at O'Hare Airport in Chicago once every 45 seconds. Calculate (without resorting to a computer) the probability of being observed during a random hour.

a) at least 75 flights taking off?

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