calculate mean , size above_ 0 40 80 120 160 200 & frequency _ 500 420 330 200 85 35 . find mean in cumulative series.
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Mean, x ¯ = ∑ ( f i × x i ) ∑ f i = 625 25 =25 ∴ x ¯ = 25 ... 80-120. 35. 100=A. 0. 0. 120-160. 30. 140. 40. 1200. 160-200. 23. 180. 80.
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