During a professor's office hours, students arrive, on average, ...

[cdr_15]

During a professor's office hours, students arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a student has just left.
 
  What is the probability that the professor has more than 20 minutes before the next student shows up?A) 0.8187
  B) 0.8647
  C) 0.1353
  D) 0.1813

Question 2

The type of diagram that shows subsets of the population on different branches is called a:
 
  A) departmental diagram.
  B) tree diagram.
  C) Venn diagram.
  D) scattered diagram.

[Carliemb17]

Answer to Question 1

C

Answer to Question 2

B