The travel time for a college student traveling between her home and her college is uniformly distributed between 40 and 90 minutes. The probability that her trip will take longer than 80 minutes is
A) 1.00.
B) 0.40.
C) 0.20.
D) 0.80.

Question

Quizplus · Accepted Answer

Since the distribution is uniform, the probability of the travel time being longer than 80 minutes is simply the proportion of the length of the distribution that is to the right of 80. That proportion is (90-80)/(90-40) = 0.20, or 20%.

The Travel Time for a College Student Traveling Between Her