The Environmental Protection Agency (EPA) requires that cities monitor over 80 c

Question

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 by assuming uniform distribution and normal distribution shown in Table 8.11 in Section 8.8. (Round your answers to 4 decimal places.)

  

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).

Explanation / Answer

for uniform distribution std deviation =range/sqrt(12)

and for normal distribution std deviation =range/4

therefore from above:

Uniform Distribution Normal Distribution   Chromium 0.0404 0.0350   Barium 0.0029 0.0025   Fluoride 0.0260 0.0225

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