Commuting to Work the Table Shows How a Company's Employees

Commuting to work The table shows how a company's employees commute to work. $\begin{array}{|c|c|c|c|c|}\hline &&{\text { Transportation }} & \\\hline \text { Job Class } & \text { Car } & \text { Bus } & \text { Train } & \text { Total } \\\hline \text { Management } & 26 & 20 & 44 & 90 \\\hline \text { Labor } & 56 & 106 & 168 & 330 \\\hline \text { Total } & 82 & 126 & 212 & 420 \\\hline\end{array}$
a. What is the marginal distribution (in %) of mode of transportation? Car Bus _ Train
b. What is the conditional distribution (in %) of mode of transportation for management? Car Bus Train
c. What kind of display would you use to show the association between job class and mode of transportation? (Just name a graph.)
d. Do job classification and mode of transportation appear to be independent? Give statistical evidence to support your conclusion.