The accompanying frequency polygon represents the number of a?country's residents below 100 years of age. Complete parts?(a) through?(f) below.

(a) What is the class width? How many classes are represented in the graph? The class width is. (Type a whole number.) There are classes represented in the graph. (Type a whole number.) (b) What is the midpoint of the first class? What are the lower and upper limits of the first class? Assume the lower and upper class limits are whole numbers. The midpoint of the first class is (Type a whole number.) The lower limit of the first class is . The upper limit of the first class is (Type whole numbers.) (c) What is the midpoint of the next to last class? What are the lower and upper limits of the next to last class? Assume the lower and upper class limits are whole numbers. The midpoint of the next to last class is (Type a whole number.) The lower limit of the next to last class is .The upper limit of the next to last class is (Type whole numbers.) (d) Which age group has the highest population?(cl) Which age group has the highest population? C) 9099 0 10.19 0 40.49 0 3039 (9) Which age group has the lowest population? 0 80-89 0 0.9 C) 9099 0 40.49 (f) Which age group has 40 million? 0 3039 0 40.49 0 6069 + 48- 44- 36+ 32- 28- Frequency (millions) 24 -5 5 15 25 35 45 55 65 75 85 95 105 115 Age