More than 50 million guests stayed at bed and breakfasts (B&Bs) last year. The Web site for the Bed and Breakfast Inns of North America (www.bestinns.com), which averages approximately seven visitors per minute, enables many B&Bs to attract guests without waiting years to be mentioned in guidebooks (Time, September 2001).

a. What is the probability of no Web site visitors in a 1-minute period?

b. What is the probability of two or more Web site visitors in a 1-minute period?

c. What is the probability of one or more Web site visitors in a 30-second period?

d. What is the probability of five or more Web site visitors in a 1-minute period?