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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. 10 8 6 2 10 15 20 25 30 35 40 45 50 55 60 Arsenic (ppb) How many measurements taken in this time frame were within [40, 45) ppb?
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Elementary Linear Algebra with Applications
Authors: Bernard Kolman, David Hill
9th edition
132296543, 978-0132296540
