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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=40 measurements (in ppb). His sample data is summarized in the
frequency distribution polygon shown below. The horizontal axis measures Arsenic in parts per
billion (ppb) and the vertical axis measures the number of measurements. How many
measurements taken in this time frame were less than 65 ppb? ans=

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A researcher for the EPA measured the amount of arsenic in t.pdf

  • 1. 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. The horizontal axis measures Arsenic in parts per billion (ppb) and the vertical axis measures the number of measurements. How many measurements taken in this time frame were less than 65 ppb? ans=