15 The Environmental Protection Agency (EPA) requires that cities monitor over 80 contaminants in their drinking water Samples from the Lake Huron Water Treatment Piant gave the results shown here. All observations were below the allowable maximum, as shown by the reported range of contaminant levels points Substance Ronge Detected 0.47 to 6.69 Allowable Maximum 100 Origin of Substance Discharge from steel and pulp mills, natural erosion Discharge from drilling wastes, metal refineries, satural erosion Natural erosion, water saltivt, discharge from Fertilizer und alueinum factories 3.004 to 8.610 2 Boor 4.6 Dueride 1.0 to 1:12 For each substance estimate the standard deviation by assuming uniform distribution and normal distribution shown in Table Sin Section 88 (Round your answers to 4 decimal places.) Nanal D