According to the U.S. Army Corps of Engineers, the top 20 U.S. ports, ranked by total tonnage (in million tons), were as follows:
PORT
TOTAL TONNAGE
South Louisiana, LA
238.6
Houston, TX
229.2
New York/New Jersey
123.3
Beaumont, TX
94.4
Long Beach, CA
84.5
Hampton Roads, VA
78.7
New Orleans, LA
77.2
Corpus Christi, TX
76.2
Baton Rouge, LA
63.9
Los Angeles, CA
57.9
Plaquemines, LA
56.9
Lake Charles, LA
56.6
Mobile, AL
54.0
Texas City, TX
49.7
Huntington - Tristate
46.8
Baltimore, MD
36.6
Duluth-Superior, MN/WI
36.5
Port Arthur, TX
34.7
St. Louis, MO and IL
33.6
Pittsburgh, PA
32.7
a. Construct a box-and-whisker plot for these data.
b. Discuss the shape of the distribution from the plot.
c. Are there outliers?
d. What are they and why do you think they are outliers?