how to find out the common factor for the formula of finding mean by step deviation method

Hey Samarth,

For individual and discrete series, common factor is simply the greatest positive number that divides the deviations. For instance, if deviations are –20, –10, 0, 40 and 60, then the common factor is 10 because 10 is the greatest positive number that divides the five numbers.
On the other hand, for a continuous series, common factor is the class size (i.e. the difference between the upper limit and lower limit). 


 

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