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A restaurant receives take-out orders at an average rate of 4/hr during the peak business hours 10am to 2pm. 1)

Find the probability the restarurant got exactly 3 orders between 1:15pm and 1:40pm. 2) If the restaurant got an order at 10am, then at what time will there be a 75% chance that at least one additional order has been made since 10am?

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