U.S. Interstate 64 runs between St. Louis, MO, at I-270 on the western end to Portsmouth, VA, at I-264 on the eastern end while passing through six states. The number of miles in each state is: Missouri—16 miles; Illinois—132 miles; Indiana—124 miles; Kentucky—191 miles; West Virginia—183 miles; Virginia—299 miles.
a. Find the mean number of miles in each state along I-64.
I-64 intersects with nine other interstate highways, besides I-264 and I-270 at its end points.
b. Find the mean distance between interchanges with other interstate highways along I-64.