Understanding ppm vs. ppb vs. percent — what do the terms "parts per million," and "parts per billion" mean?
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A researcher for the EPA measured the amount ofarsenic in the water near a sewage treatment plant.Over 5 days, he took n = 20 measurements (in ppb).His sample data is summarized in the ogive graphshown below.201510525 30 35 40 45 50 55 60 65 70Arsenic (ppb)How many measurements taken in this time framewere less than 45 ppb?ans =
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