Answer :


According to the direct method


Mean =


Mean =


Mean = 205


Total frequency(n) = 30



15 lies in the interval 200-250


so l (lower limit) = 200


cf(Cumulative frequency of the preceding class 200-250) = 13


f (frequency of median class) = 12


h (class size) = 50


Median =


Median =


Median = 208.33


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