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
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
Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter29: Tolerance, Clearance, And Interference
Section: Chapter Questions
Problem 16A: Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector...
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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
| 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
| Uniform Distribution | Normal Distribution | |
| Chromium | ||
| Barium | ||
| Fluoride | ||
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