According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over living in Portland, OR, who did not work at home, was 16.3 minutes with a standard deviation of 0.6 minutes. What is the probability that a randomly selected commuter will take between 15.1 minutes and 18.1 minutes to get to work? Use the Empirical Rule and show your work. (No credit will be given for exact calculations using technology).