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Measures of central tendency

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The best way to reduce a set of data and still retain its information is to summarize it with a single value.

Measures of central tendency—mean, median, and mode—can help you capture, with a single number, what is typical of a data set.

The mean is the average value of all the data in the set.

The median is the middle value in a data set that has been arranged in numerical order so that exactly half the data is above the median and half is below it.

The mode is the value that occurs most frequently in the set.

In a normal distribution, mean, median and mode are identical in value.