"Play by the rules, take turns and share" is the guideline for which character trait?

Arrivals in a university advising office during the week of registration are known to follow a Poisson distribution with an average of 4 people arriving each hour

(a) What is the probability that exactly 4 people will arrive in the next hour? (b) What is the probability that exactly 5 people will arrive in the next hour?

Which of the following is not a derivative instrument?

A) Contract to sell corn B) Option agreement to buy land C) Installment sales agreement D) Mortgage backed security