Among 20- to 25-year-olds 30% say they have used a computer white under the infl

Question

Among 20- to 25-year-olds 30% say they have used a computer white under the influence of alcohol Suppose four 20- to 25-year-olds are selected at random. What is the probability that at least one has not used a computer white under the influence of alcohol? What is the probability that at least one has used a computer while under the influence of alcohol? The probability that at least one has not used a computer while under the influence of alcohol is square box. (Round to four decimal places as needed.) The probability that at least one of the four randomly selected adults has used a computer while under the influence of alcohol is square box.(Round to four decimal places as needed.)

Explanation / Answer

here p = 0.3

four people selected at random

(A)

At least one has not used computer while under the influence of alcohol. This means more than one has used the computer while under the influence of alcohol

Probability that None has not used the computer while under the influence of alcohol = 1 - 0.3^1*0.7^3 = 0.8971

(B)

Probability that atleast one has used the computer while under the influence of alcohol = 1 - 0.7^4 = 0.7599

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