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[" 16."],[" For a frequency distribution mean deviation "],[" from mean is computed by "],[[" (a) M.D."=(Sigma d)/(Sigma f)," (b) M.D."=(Sigma fd)/(Sigma f)],[" (c) M.D."=(sum f|d|)/(Sigma f)," (d) M.D."=(Sigma f)/(sum f|d|)]]

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