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CABARRUS COUNTY 2012 APPRAISAL MANUAL <br />FREQUENCY DISTRIBUTIONS <br />This is a good time to discuss distributions. All frequency distributions are an arrangement of numerical data according to size <br />or magnitude. Distributions are normally presented as tables or graphs. The following table and graph is taken from our <br />example: <br />SALES RATIO NUMBER OF <br />CLASS INTERVAL OCCURENCES <br />91 <br />- 100 2 <br />81 <br />- 90 3 <br />71 <br />- 80 3 <br />61 <br />- 70 1 <br />51 <br />- 60 1 <br />10 <br />NUMBER 4 <br />3 <br />2_ <br />I <br />SALES RATIOS <br />When describing our observations, we really are trying to use numbers [mean, median, mode, standard deviation, average <br />deviation, etc.] to give a mental picture of what our frequency distribution would look like if we drew it on a graph. <br />A particularly shaped distribution is the one from which we depart when trying to visualize the shape of a distribution when <br />given such statistics as the mean, median and mode for information. The reference point is what is called the "NORMAL <br />DISTRIBUTION'. It has some particular features by which it is characterized and referred to. This is what it looks like: <br />io io <br />6s% 2G% <br />"Normal" Distribution Showing the Percentage of the Area Included Within One Standard Deviation Measured Both Plus and <br />Minus About the Arithmetic Mean. <br />The MEAN, MEDIAN, and MODE are all equal. It also possesses some traits which make it statistically useful in making <br />Cabarrus County — 2012 Revaluation STATISTICS & THE 10-7 <br />APPRAISAL PROCESS 8/9/11 <br />Attachment number 11 <br />G -6 Page 302 <br />60 70 80 90 100 <br />