Chapter 4.2, Problem 34BB

Complements and the Addition Rule Refer to the table used for Exercises 9–20. Assume that one order is randomly selected. Let A represent the event of getting an order from McDonald’s and let B represent the event of getting an order from Burger King. Find $P\left(\overline{A\text{ or }B}\right)$, find $P\left(\bar{A}\text{ or }\bar{B}\right)$, and then compare the results. In general, does $P\left(\overline{A\text{ or }B}\right)$ = $P\left(\bar{A}\text{ or }\bar{B}\right)$?

In Exercises 9-20, use the data in the following table, which lists drive-thru order accuracy at popular fast food chains (data from a QSR Drive-Thru Study). Assume that orders are randomly selected from those included in the table.