Cumulative frequency polygon

The cumulative frequency distribudon can also be disph ed using a histogram or a cumulative frequency polygon, as shown in Figures 19.2 and 19.3, respectively. These figures... 

A modification of the histogram display of differences is a plot suggested by Krouwer and Mont)P Icnown as the mountain plot. This is a plot of cumulative frequencies (c/%) of differences up to 50% with subsequent subtracted cumulative frequencies (100% - cf%). Such a plot shows in principle the same information as a histogram or frequency polygon plot. An advantage may be that the percentiles can be directly read from the plot. 

Consider the set of data below, which represents polychlorinate biphenyl (PCB) levels in a contaminated water stream for a given hour for 25 days. As a first step in summarizing the data, you are requested to form a frequency table, a frequency polygon, a cumulative frequency table, and a cumulative frequency distribution curve. 

For Problem 19.1, calculate the cumulative frequency and plot a cnunularive-frequency polygon. 

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See also in sourсe #XX -- [ ]

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