RangeThe most elementary measure of variation is range. Range is defined as the difference between the largest and smallest values. The range is a single number. To say that the range is from $190 to $200, although informative, is not really a correct use of the term. The range for Employee A is $210 – $190 = $20; the range for Employee B is $400 – $0 = $400. Deviation and varianceThe deviation is defined as the distance of the measurements away from the mean. In Table 1, Employee A's earnings have considerably less deviation than Employee B's do. The variance is defined as the sum of the squared deviations of n measurements from their mean divided by ( n – 1). So, from Table 1, the mean for Employee A is $200, and the deviations from the mean are as follows:
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