A fast-food restaurant has determined that customers order soft drinks 80 percent of the time, hamburgers 70% of the time, and French fries 50% of the time. Assume, for this analysis, that orders for items are independent (for example, ordering a hamburger does not reduce or increase the chance of ordering other items).

a)What percent of the restaurant's customers order at least one of French fries or hamburger?

b)What is the chance that fewer than two of the next five customers will order French fries? Assume that the ordering patterns of customers in the selected sample is typical of the ordering patterns of other customers.