A researcher for the EPA measured the amount of arsenic in the water near a sewage treatment plant. Over 5 days, she took n = data is summarized in the ogive graph shown below. 20 water measurements (in ppb). Her sample 20 15 10 5 |10 15 20 25 30 45 50 55 Arsenic (ppb) How many measurements taken in this time frame were less than 35 ppb? ans = How many measurements taken in this time frame were less than 45 ppb? ans =

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A:

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