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The following table gives the cumulative frequency distribution of annual incomes (in thousands of dollars)for a sample of 200 families selected from a city.
Use the following to answer questions : The following table gives the cumulative frequency distribution of annual incomes (in thousands of dollars)for a sample of 200 families selected from a city.    -The cumulative percentage for the second class,rounded to one decimal place,is:
-The cumulative percentage for the second class,rounded to one decimal place,is:


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