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* Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator. Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator.
In statistics, a central tendency (or, more commonly, a measure of central tendency) is a central or typical value for a probability distribution.It may also be called a center or location of the distribution.Colloquially, measures of central tendency are often called averages.hat is, given a measure of statistical dispersion, one asks for a measure of central tendency that minimizes variation: such that variation from the center is minimal among all choices of center. In a quip, dispersion precedes location.