Measures of central tendency are measures of the location of the middle or the
center of a distribution. The definition of "middle" or "center"
is purposely left somewhat vague so that the term "central tendency" can
refer to a wide variety of measures. The mean is the most commonly used measure of
central tendency. The following measures of central tendency are discussed in this
For symmetric distributions, these measures are all the same. For skewed
distributions, they can differ markedly.