An easement contract occurs when one person agrees to answer for the debts or duties of another person

A woman whose engagement is ended takes off her engagement ring and throws it in the trashcan in her office, whereupon the custodian finds it that night while cleaning the empty office building. The diamond ring is:

A) Mislaid. B) Lost. C) Abandoned. D) Fake.

A new shopping mall is considering setting up an information desk operated by two employees. Based on information obtained from similar information desks, it is believed that people will arrive at the desk at the rate of 20 per hour

It takes an average of 4 minutes to answer a question. It is assumed that arrivals are Poisson and answer times are exponentially distributed. (a) Find the proportion of the time that the employees are busy. (b) Find the average number of people waiting in line to get some information. (c) Find the expected time a person spends just waiting in line to have his question answered.