Assuming uniform distribution and normal distribution

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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.

Substance MCLG Range Detected Allowable MCLG Origin of Substance   Chromium 0.47 to 0.69 100 Discharge from steel and pulp mills, 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

MCLG = Maximum contaminant level goal

For each substance, estimate the standard deviation σ by assuming uniform distribution and normal distribution shown in Table 8.11 in Section 8.8. (Round your answers to 4 decimal places.)

Reference no: EM131894916

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