How much time do commuters living in or near cities spend waiting in traffic, and how much does this waiting cost them per year? The file Congestion contains the time spent waiting in traffic and the yearly cost associated with that waiting for commuters in 31 U. S. cities. (Source: Data extracted from “The High Cost of Congestion, ”Time, October 17, 2011.) For both the time spent waiting in traffic and the yearly cost associated with that waiting data,

a. Construct a frequency distribution and a percentage distribution.
b. Construct a cumulative percentage distribution.
c. What conclusions can you reach concerning the time Americans living in or near cities spend sitting in traffic?

d. What conclusions can you reach concerning the time and cost of waiting in traffic per year?