Final answer:
The class width is the range of values in a histogram. The lower class limit is the smallest value included, and the upper class limit is the largest value included. The minimum number of miles traveled can be found using the lower class limit of the first bar.
Step-by-step explanation:
The class width refers to the range of values that are grouped together in a histogram. It can be calculated by subtracting the lower class limit from the upper class limit and adding 1.
The lower class limit is the smallest value that can be included in a class interval, while the upper class limit is the largest value that can be included.
In order to determine the minimum number of miles traveled by an automobile in the given histogram, we need to look at the lower class limit of the first bar in the histogram.