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. All observations were below the allowable maximum, as shown by the reported range of contaminant levels. (presumably the mean would be the midrange).  Substance Range Detected AllowableMaximum 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 Natural erosion, water additive, discharge from fertilizer and aluminum factories    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.)     Uniform Distribution Normal Distribution Chromium     Barium     Fluoride

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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. All observations were below the allowable maximum, as shown by the reported range of contaminant levels. (presumably the mean would be the midrange).
 

Substance Range Detected Allowable
Maximum
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 Natural erosion, water additive, discharge from fertilizer and aluminum factories
 

 
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.)
  

  Uniform Distribution Normal Distribution
Chromium    
Barium    
Fluoride    
 
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When I put these values in they appear to all incorrect, any other thoughts?

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