Section 14.2 Reference Topics
This site provides some practice with the mean:
http://www.robertniles.com/stats/mean.shtml
This site provides some practice with the median:
http://www.robertniles.com/stats/median.shtml
This interactive site calculates the mean and median for a data set.
http://www.svgs.k12.va.us/math/Statistics/Histogram/Mean.html
Mean, median, and mode discussion.
http://www.shodor.org/interactivate/discussions/sd1.html
This is not a fancy site, but is interesting. It is more advanced than the textbook.
http://www.physics.csbsju.edu/stats/