Circle graphs, or pie charts as they are also known, are pictorial representations of the relative frequencies of categorical data. A circle graph that depicts relative frequency displays the percentage of each category on each section of the circle. A pie chart is best to use when you only have a few categories and you want to demonstrate a part-to-whole relationship. Making each slice a different color adds to the visual appeal of this type of graph.
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Cumulative Frequency is The total of a frequency and all frequencies so far in a frequency distribution. It is the 'running total' of frequencies in the frequency distribution table.
Concentric Circles?
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The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.