The accompanying frequency polygon represents the number of a country's residents below 100 years of age. Complete parts (a) through () below. a Click the icon to view the frequency polygon. (a) What is the class width? How many classes are represented in the graph? The class width is 10. (Type a whole number.) There are 10 classes represented in the graph. (Type a whole number.) (b) What is the midpoint of the second class? What are the lower and upper limits of the second class? Assume the lower and upper class limits are whole numbers. The midpoint of the second class is (Type a whole number.)

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