A researcher for the EPA measured the amount of arsenic in the water near a sewage 20 water measurements (in ppb). Her sample treatment plant. Over 5 days, she took n = data is summarized in the ogive graph shown below. 20 15 10 40 45 50 55 60 65 70 75 80 85 Arsenic (ppb) How many measurements taken in this time frame were less than 65 ppb? ans = How many measurements taken in this time frame were less than 75 ppb? ans = oo-o–00-0

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