3. The following frequency table shows the commute time to work in minutes intervals that are 15 minutes wide. For example, 518 people (39.18%) had between a 0- and 14-minute commute.

Estimate the mean commute time based on this table

Total 1,322 100.00 75-89 12 0.91 100.00 60-74 59 4.46 99.09 45-59 72 5.45 94.63 30-44 210 15.89 89.18 15-29 451 34.11 73.30 0-14 518 39.18 39.18 time Freq. Percent Cum. Commute