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Frequency Polygon

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Here are the shopping times (in minutes) for a sample of 21 shoppers at a particular grocery store:

26 23 44 41 38 35 31 28 25 22 43 40 37 34 31 43 43 39 39 36 36
Draw the frequency polygon for these data using an initial class boundary of 21.5, an ending class boundary of 46.5 and 5 classes. Note that you can add or remove classes from the figure. Label each class with its midpoint.

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