Many communities are finding it more and more difficult to ill municipal positions such as town administrators, finance directors, and treasurers. The following table shows the percentage of municipal managers by age group in the United States for the years 1971 and 2006.

a. In 1971, what was the probability that a municipal manager was 40 years old or younger? In 2006, what was the probability that a municipal manager was 40 years old or younger?
b. In 1971, what was the probability that a municipal manager was 51 years old or older? In 2006, what was the probability that a municipal manager was 51 years old or older?
c. What trends in ages can you detect from municipal managers in 1971 versus municipal managers in2006?

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Age Under 30 30 to 40 41 to 50 51 to 60 Over 60 1971 26% 45% 21% 5% 3% 2006 1% 12% 28% 48% 11%