Answer
a. May, $\bar x= 391.7$
b. 2003, $\bar x= 289.75$
c. See below for boxplots. All the distributions are non-symmetric.
The mean values increase from 2005 to 2004 to 2003.
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 3 - Data Description - 3-4 Exploratory Data Analysis - Exercises 3-4 - Page 173: 18
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