4. Global Airlines operates two types of jet planes: jumbo and ordinary. On jumbo jets, 25% of the passengers are on business, while on ordinary jets 30% of the passengers are on business. Of Global's air fleet, 40% of its capacity is provided on jumbo jets. What is the probability a randomly chosen business customer flying with Global is on a jumbo jet? .357 .444 .542 .563

Ponderosa Paint and Glass carries three brands of paint. A customer wants to buy another gallon of paint to match paint she purchased at the store previously. She can’t recall the brand name and does not wish to return home to find the old can of paint. So, she selects two of the three brands of paint at random and buys them. What is the probability that she matched the paint brand? Her husband also goes to the paint store and fails to remember what brand to buy. So, he also purchases two of the three brands of paint at random. Determine the probability that both the woman and her husband fail to get the correct brand of paint. (Hint: Are the husband’s selections independent of the wife’s selections?)

A Yale Daily found that 49 percent of students identified themselves as liberal, 15 percent as conservative, and 36 percent as moderate. In addition, 2% of Yale Students are enrolled at the School of the Environment. Does this mean that that .15*.02=.003 or 0.3% of Yale students are Conservative Environmentalists? Explain using probability terms.

The management of the large department store in Example B.1 must determine whether more training is neededfor the customer service clerk. The clerk at the customer service desk can serve an average of three customersper hour. What is the probability that a customer will require 10 minutes or less of service?