The side-by-side boxplots show the cumulative college GPAs for sophomores, juniors, and
seniors taking an intro stats course in Autumn 2003. 
a. Which class (sophomore, junior, or senior) had the lowest cumulative college GPA?
What is the approximate value of that GPA?
b. Which class has the highest median GPA, and what is that GPA?
c. Which class has the largest range for GPA, and what is it?
d. Which class has the most symmetric set of GPAs? The most skewed set of GPAs?
Definitions:
Income
The total revenue received by an entity from its operational and non-operational activities during a specific time period.
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