U. S. Census data for San Luis Obispo County, California, were used to construct the following frequency distribution for commute time ( in minutes) of working adults ( these frequencies were approximated from a graph that appeared in the San Luis Obispo Tribune [ September 1, 2002]):

a. Notice that not all intervals in the frequency distribution are equal in width. Why do you think that unequal width intervals were used?
b. Construct a table that adds relative frequency and density columns to the given frequency distribution.
c. Use the densities computed in Part (b) to construct a histogram for this data set.
Write a few sentences commenting on the important features of the histogram.

Transcribed Image Text:

Commute Time 0 to 5 5 to 10 10 to <15 15 to <20 20 to <25 25 to <30 3° to < 35 35 to 40 40 to <45 45 to <60 60 to 90 90 to 120 Frequency 5.200 18.200 19,600 15.400 13.800 5.700 10,200 2,000 2.000 4.000 2.100 2.200