THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The amount of time you have to wait at a particular stoplight is uniformly distributed between zero and two minutes.
-What is the probability that you have to wait more than 30 seconds for the stoplight?
A)0.25
B)0.50
C)0.75
D)1.01

Question

Quizplus · Accepted Answer

Since the wait time is uniformly distributed between 0 and 2 minutes (or 0 and 120 seconds), waiting more than 30 seconds means waiting anywhere between 31 and 120 seconds. This range is 90 seconds out of the total 120 seconds, so the probability is 90/120 = 0.75.