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Among 20- to 25-year-olds, 25% say they have written an editorial letter while under the influence of alcohol. Suppose seven 20-to 25-year-olds are selected at

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Among 20- to 25-year-olds, 25% say they have written an editorial letter while under the influence of alcohol. Suppose seven 20-to 25-year-olds are selected at random. Complete parts (a) through (d) below. (a) What is the probability that all seven have written an editorial letter while under the influence of alcohol? (Round to four decimal places as needed.) (b) What is the probability that at least one has not written an editorial letter while under the influence of alcohol? (Round to four decimal places as needed.) (c) What is the probability that none of the seven have written an editorial letter while under the influence of alcohol? (Round to four decimal places as needed.) (d) What is the probability that at least one has written an editorial letter while under the influence of alcohol? (Round to four decimal places as needed.)

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