Mean of a Continuous Series
Direct method · Assumed mean method
Group raw data into class intervals
Find the mid-value of a class
Find the mean by the direct method
Find the mean with an assumed mean
Find a missing frequency
X̄ = Σfx ÷ Σf
20 houses, Σfx = 90 members
X̄ = 90 ÷ 20 = 4.5 members
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