Analysis of bottled water. Is the bottled water you’re

Analysis of bottled water. Is the bottled water you’re

Analysis of bottled water. Is the bottled water you’re drinking really purified water? A study of various brands of bottled water conducted by the Natural Resources Defense Council found that 25% of bottled water is just tap water packaged in a bottle (Scientific American, July 2003). Consider a sample of five bottled-water brands, and let x equal the number of these brands that use tap water.
a. Explain why x is (approximately) a binomial random variable.
b. Give the probability distribution for x as a formula.
c. Find P(x = 2).
d. Find P(x ≤ 1).

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