77. Lead Contamination in Trout. The Washington State Department of Ecology reported that the mean lead contamination in trout in the Spokane River is 1 part per million (ppm), with a standard deviation of 0.5 ppm.10 Suppose a sample of trout has a mean lead contamination of . Assume that .
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(a) and the population standard deviation is known. (b) (0.902, 1.098) (c) We are 95% confident that μ, the population mean lead contamination for all trout on the Spokane River, lies between 0.902 ppm and 1.098 ppm.