8. Find the quartile deviation of the following distribution: X 60,62,64,66,68,70,72 f 4,10,18,26,20,12,5
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e,
Highest value (H)= 35
Lowest value (L) = 15
Range= Highest value − Lowest value
i.e. R= H− L
Substituting the given values in the formula
R= 35 − 15= 20
Coefficient of Range is as follows:
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