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(a) For each substance, estimate the standard deviation by using the methods shown in Table 8.11 in section 8.7. (b) Why might an estimate of be

(a) For each substance, estimate the standard deviation σ by using the methods shown in Table 8.11
in section 8.7. (b) Why might an estimate of σ be helpful in planning future water sample testing?
Substance MCLG Range Detected Allowable MCLG Origin of Substance
Chromium 0.47 to 0.69 100 Discharge for steel
and pulp mills, natural
erosion
Selenium 0 to 0.0014 50 Corrosion of household
plumbing, leaching from
wood preservatives,
natural erosion
Barium 0.004 to 0.019 2 Discharge from drilling
wastes, metal refineries,
natural erosion
Fluoride 1.07 to 1.17 4.0 Natural erosion, water
additive, discharge from
fertilizer and aluminum
factories

This question was asked on May 23, 2010.

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