The Environmental Protection Agency requires that cities monitor over 80 contaminants in their drinking water. Samples for the Lake Huron Water Treatment Plant gave the following results. Only the rangeis reported not the mean. For each substance, estimate the standard deviationfor Uniform and Normal distribution. (round answers to 4 decimal places)
Detected Allowable MCLG
Chromium 0.47 to 0.69 100
Barium 0.004 to 0.019 2
Fluoride 1.07 to 1.17 4.0
I am looking for some direction on how to approach the equation. I have no idea on where to start. I have the Normal Distribution of Chronium of .0367, Barnium is .0025 and Fluoride is .0167 – Can not figure out the Uniform Population.
For each substance, estimation the standard deviation for Uniform and Normal distribution is in an attached PDF.