Question

In: Statistics and Probability

Is the bottled water you are drinking really purified water? In a four-year study of bottled...

Is the bottled water you are drinking really purified water? In a four-year study of bottled water brands conducted by the Natural Resources Defense Council found that 25% of bottled water is just tap water packed in a bottle. Consider a sample of five brands of bottled water and let X equal the number of these brands that use tap water.

a. Explain why X is (approximately) a binomial random variable.

b. Find that the P (X = 2)

c. Find that the P (X <= 1)

d. Calculate the expected value and standard deviation of the distribution.

Solutions

Expert Solution

Binomial distribution​​​​​


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