To solve a problem, first you need to define the problem

Homeowner association liens that exceed $1,800 and have been delinquent for more than one year:

A. are only enforceable if the lien is on the association's clubhouse and swimming pool B. can never be foreclosed C. can be foreclosed D. are not covered by the law

Customers enter the waiting line to pay for food as they leave a cafeteria on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution

If the average number of arrivals is four per minute and the average service rate of a single server is seven per minute, what proportion of the time is the server busy? A) 0.43 B) 0.57 C) 0.75 D) 0.25 E) 0.33