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Deviation Measures
The drawback of the range as a measure of dispersion is that it takes into account the values of only two data points - the largest and the smallest.
One way to have a dispersion measure that takes into account every data point is to use deviations. Deviation means difference. We can find the average of the deviations of the data points from a fixed value.
AP = deviation of A from P BP = deviation of B from P CP = deviation of C from P
AP = deviation of A from P
BP = deviation of B from P
CP = deviation of C from P
We can find average deviation of a set of observations from any fixed number.
Mode Mode is the value of the observation which occurs with the greatest frequency and thus it is the most fashionable value, Mode has been derived from French word La m
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