I'm reading up on standard deviation.(adsbygoogle = window.adsbygoogle || []).push({});

Wiki seems to use 'average' and 'mean' interchangeably.

"find the arithmetic mean (average) of 3, 7, 7, and 19"

Their answer is9, which I would call the "average". The mean, to me is the middle value of the set, in this case,7.

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# Average versus mean

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