Exhibit 6-5.The mean travel time to work is 25.2 minutes (U.S.Census 2010).Further,suppose that commute time follows a log-normal distribution with a standard deviation of 10 minutes. Refer to Exhibit 6-5.What is the probability a randomly selected U.S.worker has a commute time of more than half an hour?
A)25.78%
B)31.56%
C)68.44%
D)74.22%

Question

Quizplus · Accepted Answer

The probability that a randomly selected U.S. worker has a commute time of more than half an hour is 25.78%. This is because the log-normal distribution is a skewed distribution, with a long tail to the right. This means that there is a higher probability of observing extreme values, such as commute times that are much longer than the mean.