The article cited in Exercise 20 also gave the following values of the variables and : y

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The article cited in Exercise 20 also gave the following values of the variables and

:

y 1010020111210011011 z 1861153004400121404 z 5 number of intersections y 5 number of cul y 11 0001 1201221102110 z 0 3 0 1 10 1 3 2 4 6 6 0 1 1 8 3 3 5 y 15030110 0 z 0 5 23 10 0 0 3

a. Construct a histogram for the y data. What proportion of these subdivisions had no culs-de-sac? At least one cul-de-sac?

b. Construct a histogram for the z data. What proportion of these subdivisions had at most five intersections? Fewer than five intersections?

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