At a Course in Public Speaking, the Instructor Always Gives

Multiple Choice

At a course in public speaking, the instructor always gives an opening speech that lasts between fifteen and eighteen minutes. The length of the speech can be modeled by a uniform distribution, that is, the speech is just as likely to last fifteen minutes as it is to last eighteen minutes. The probability density curve is shown below. What is the probability that the speech will last at least seventeen minutes? What is the probability that the speech will last between fifteen and sixteen minutes?

A) Can't be determined with the given information
B) 0.50; 0.25
C) 0.50; 0.75
D) 0.25; 0.50