Central tendency is a loosely defined concept that has to do
with the location of the center of a distribution. The section
"What is Central Tendency" presents three definitions of the
center of a distribution. "Measures of Central Tendency" presents
the three most common measures of the center of the distribution.
The three simulations that follow relate the definitions of the
center of a distribution to the commonly used measures of central
tendency. The findings from these simulations are summarized
in the section "Mean and Median." The "Mean and Median" allows
you to explore how the relative size
of the mean and the median depends on the skew of the distribution.

Less frequently used measures of central tendency
can be valuable supplements to the more commonly used measures.
Some of these measures are presented in "Additional Measures."
Finally, the last section compares and summarizes differences
among measures of central tendency.