Measures of central tendency

Mean

Add all the measurements together then divide by the number of measurements taken.

Median

Arrange the data in order and take the middle value as the median.

Mode

The value which occurs most often.

Measures of dispersion

Dispersion

The spread of data around the average.

Range

Range is the distance between the highest and lowest value.

Example: 12 17 21 23 24 24 25 26 29 31
Range = 12–31

Interquartile range is the part of the range that covers the middle 50% of the data.


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