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quartile- one of the values of a variable that divides the distribution of the variable into four groups having equal frequencies.
The quartile deviation(QD) is half the difference between the highest and lower quartile in a distribution.
If a divides b and b divides a then either a is equal to b or a is equal to -b. Additional note: if a divides b, there exist a p such that ap=b. and if b divides a, there exist a q such that a=bq. then ap=(bq)p=b => b(1-pq)=0 => pq=1 since b!=0 => p=q=1 or p=q=-1 => a=b or a=-b
The sum of proportions computed from a frequency distribution must equal
They are all equal . . . they are the same.(In an asymmetric distribution they are not equal.)