The following cumulative frequency polygon shows the hourly wages of
The following cumulative frequency polygon shows the hourly wages of a sample of certified welders in the Atlanta, Georgia, area.


a. How many welders were studied?
b. What is the class interval?
c. About how many welders earn less than $10.00 per hour?
d. About 75% of the welders make less than what amount?
e. Ten of the welders studied made less than what amount?
f. What percent of the welders make less than $20.00 perhour?
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