Please help I don't know how to answer these questions correctly.. the graph is age Across the bottom numbers 40-70 and frequency is the long way numbers 0-12..

a. What is the class width for each interval on the histogram? b. Which age range has been the most frequent for presidents at inauguration? C. Which age range has been the least frequent for presidents at Inauguration? d. The data in the histogram does not include our current president, Joe Biden, suppose we added in his age of 78, how would this affect the histogram? Would it skew left or skew right or be symmetric