Page 2 - H.A Measures of dispersion (xi)
P. 2

CONTINUOUS SERIES (GROUPED DATA)











































               Where, N= total frequency


               ℓ= lower boundary of the first quartile class

               f= frequency of the first quartile class

               ‹C= the cumulative frequency corresponding to


               the class just before the first quartile class

               i= the length of the first quartile class

               Similarly,
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