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A researcher for the EPA measured the amount of arsenic in the water near a sewage treatment plant. Over 12 days, he took n =

A researcher for the EPA measured the amount of arsenic in the water near a sewage treatment plant. Over 12 days, he took n = 40 measurements (in ppb). His sample data is summarized in the frequency distribution polygon shown below. 12 Do 10 8 35 40 45 50 55 60 65 70 75 80 85 T Arsenic innhi TR How many measurements taken in this time frame were within [50, 55) ppb? ans = Check

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