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Mathematics, 08.10.2019 01:00 jermainedwards

The water department checks the city water supply on a regular basis for
contaminants such as trihalomethanes (thms). the water department takes
200 samples and estimates that the concentration of thms in your drinking
water is 3 ppb (parts per billion), with a standard deviation of 0.3 ppb.
assuming the samples were random and unbiased, how much confidence
can you have in this data?

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