consider the serial no. 4. The flow rate at this serial number is indicated as 3700 m /wk and, under the column of Zn, the value is 4. This 4 represents the sum of the number of values equal to or greater than 3700; these values being 3700, 3785, 4000, and 4020. The values 3785, 4000, and 4020 are the values above the element 3700 which numbers 3. Adding 3 to the count of element 3700, itself, which is 1, gives 4, the number under the column Zn .
The column Zn/(Zavaii + 1) = Zn/(14 + 1) is the cumulative probability of the item at a given serial number. For example, the element 3700 has a cumulative probability of 0.27. This cumulative probability is the same Prob(value equaled or exceeded) = Prob(value equaled) + Prob(value1 exceeding) + ••• used previously.
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