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Home > CCG > Chapter 9 > Lesson 9.1.3 > Problem 9-36


A sandwich shop delivers lunches by bicycle to nearby office buildings. Unfortunately, sometimes the delivery is made later than promised. A delay can occur either because food preparation took too long, or because the bicycle rider got lost. Last month the food preparation took too long or the rider got lost, % of the time. During the same month, the food preparation took longer than expected times and the bicycle rider got lost times. There were deliveries made during the month. For a randomly selected delivery last month, find the probability that both the food preparation took too long and the rider got lost.  

By the Addition Rule: