# Measures of Central Tendency : key information

Name and define three measures of central tendency. Give their formulas and an example of application.

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#### Solution Preview

1. The mean is the most common measure of central tendency. It simply the sum of the numbers divided by the number of numbers. The symbol m is used for the mean of a population. The symbol M is used for the mean of a sample.

The formula for M is:

M = σX/N

where σX is the sum of all the numbers in the sample and

N is the number of numbers in the sample.

Example: The mean of 7, 12, 24, 20, 19 is (7 + 12 + 24 + 20 + ...

#### Solution Summary

The solution names and defines three measures of central tendency.

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