3. The following chart shows the annual salaries of a group of workers recently interviewed Salary (in $) 0-< 10000 Frequency Cumulative Frequency 2 < 20000 < 30000 30000 < 40000 10000 26 20000 35 20 40000 -< 50000 10 50000 – < 60000 2 60000 -< 70000 70000 - 80000 3 Using the grouped data in the chart calculate the following: median the interquartile range Po and P a. b. c.

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