Constructing Frequency Distributions. In Exercises 13-20, use the indicated data to construct the frequency distribution. (The data for Exercises 17-20 can be downloaded at TriolaStats.com.) 13. Chicago Commute Time Listed below are the first 50 Chicago commute times from Data Set 31. Construct a frequency distribution. Use a class width of 15 minutes and begin with a lower class limit of 0 minutes. Do the data amounts appear to have a normal distribution? Examine the data and identify anything appearing to be unique. 60 15 35 30 15 45 10 15 15 30 12 30 30 45 30 20 20 15 25 45 60 15 28 30 30 60 30 45 30 1 12 45 20 10 15 45 45 35 60 20 20 20 30 4 80 45 30 60 45 25 30