4. Consumer: Radon Gas Radon: The Problem No One Wants to Face is the title of an...

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4. Consumer: Radon Gas “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 liter (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 2.8 5.7 4.2 1.9 8.6 3.9 7.2

(a) Find the mean, median, and mode.

(b) Find the sample standard deviation, coefficient of variation, and range.

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