The graph below shows cumulative proportions plotted against numbers of employees working in mid-sized retail establishments. 0.8+ 0.6+ 0.4 + 0.2 + 0.0 10 20 30 40 50 60 Number of employees 70 80 What is the approximate interquartile range? 68 O 35 O 57 O 75 O 18 Cumulative proportion

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