At this time of the year there is a period of review. One of the questions I was recently asked was about the term "mean" instead of "average". That is a common question as many of us were taught using the term 'average'. In simple terms: An average is the relationship a number has to the arithmetic mean; while the mean is the actual value when averaging numbers (finding the central point in relationship to all numbers).

For example, if the arithmetic mean of a set of numbers is 75, a value of 80 may be above average while a value of 76 may still be considered average.

Averaging the numbers in a set of data results in finding the mean. Much like multiplying a factor pair results in finding the product.

I give a brief explanation of data terms, as well as an example of both a line and stem&leaf plot in the voicethread video below.

## Wednesday, September 17, 2008

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