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If a sandwich delivery takes longer than 30 minutes, the sandwich is free. If the average time for delivery is 18 minutes with a standard deviation of 4 minutes and delivery time is normally distributed: What percent of sandwich will be free? Delivery drivers who complete deliveries in fewer than 10 minutes get a bonus. What percent of deliveries grant bonuses to drivers? Delivery drivers who are “buzzer beaters” – meaning they deliver the sandwich with less than two minutes to spare – get a reprimand. What percent of deliveries are within the 30-minute threshold, but still lead to a driver reprimand?