Anaveragegives us information about some class of things,S; what it tells us is the central value ofSs on some quantitative variable.There are two different kinds of average: the

arithmetic meanand themedian.To find the arithmetic mean, you add up the values of each

Sand then divide by the number ofSs.The median score is the one that lies in the middle of all the scores, so that an equal number of scores are higher and lower.

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