Problem 1: Northern Airlines regularly hires and trains new flight attendants. The airline requires a staff of 1,000 trained attendants to maintain their flight services. Due to the nature of the job, there is a high turnover of flight attendants with the average job tenure of a flight attendant being two years. How many flight attendants on average does Northern Airline need to hire and train every year to maintain their flight services?
Problem 2: A Museum has three million visitors per year. Each visitor spends an average of 1 hour in the museum. What is the average number of visitors in the museum (during its opening hours) if the museum is open 300 days a year from 9 a.m. to 5 p.m.?
Problem 3: A drive-through at a Fast Food serves 300 customers over a 10-hour day. On average, a customer spends a few minutes waiting in line, 3 minutes placing the order, and 5 minutes completing the order before leaving the drive-through. On average there are 5 customers in the drive-through (i.e., this include those who are waiting in line, those placing orders and those completing the order). What is the average time a customer spends waiting in line before placing order?
Problem 4: When a homeowner wants to sell his or her home, the property is typically posted on a regional listing service. In a particular region, 60% of the new properties added to the listing service in the average week are houses. The remaining 40% of new listings are condominiums. The average house sells in 4.5 weeks. The average condominium sells in 8.25 weeks. What percent of active listings (i.e., properties posted on the listing service but not yet sold) are condominiums?