Radon: The Problem No One Wants to Face" is the title of an article appearing in Consumer Reports. Radon is a gas emitted from the ground that can collect in houses and buildings. At certain levels it can cause lung cancer. Radon concentrations are measured in picocuries per litr (pCi/L). A radon level of 4 pCi/L is considered acceptable." Radon levels in a house vary from week to week. In one house, a sample of 8 weeks had the following readings for radon level (in pCi/L). 1.9 2.7 5.7 4.2 1.9 8.1 3.9 7.5
a. Find the mean, median, and mode.
b. Find the sample standard deviation, coefficient of variation, and range.