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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 the succeeding sections we will give statistical measures for these concepts of central tendency. Definitions of Center. Now we explain the three different ways of defining the center of a distribution. All three are called measures of central tendency. Balance Scale. One definition of central tendency is the point at which the distribution is in balance. Figure 2 shows the distribution of the five numbers 2, 3, 4, 9, 16 placed upon a balance scale.