The measures of central tendency are used as a representative of an entire group of values. They are:
■ The mean is simply the average of all values in the population or sample.
■ The median is the middle value in the distribution, such that there are an equal number of values, both, to its left and right side.
■ The mode is the value which occurs the most number of times.
Read more at Buzzle: http://www.buzzle.com/articles/types-of-skewed-distribution-with-real-life-examples.html