The **Mean **is measure of central tendency, calculated by the sum of all the data points divided by the number of data points. It is generally referred to as the “average.”

- The mean is used to compute the average value (not middle or most common value) of a data set.
- The two means used in statistics are the population mean and the sample mean.

The mean can be a line on a graph or a number in a chart. The average value for a variable in a data set is denoted by that variable with a bar over it, and the average value for a population is denoted by the Greek letter Mu.

For an introduction on calculating the mean, this website is useful. A good Youtube instructional video on how outliers and data point location affect both the median and mean can be found in the link above.

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