SOLUTION: The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in
their drinking water. Samples from the Lake Huron Water Treatment Plant gave the res
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their drinking water. Samples from the Lake Huron Water Treatment Plant gave the res
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Question 321071: The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in
their drinking water. Samples from the Lake Huron Water Treatment Plant gave the results shown here. Only the range is reported, not the mean (presumably the mean would be the midrange). For each substance, estimate the standard deviation σ by using the methods shown in Table 8.11in section 8.7.
(b) Why might an estimate of σ be helpful in planning future water sample testing?
(