Suppose approximately 75% of all marketing personnel are extroverts, whereas about 70% of all computer programmers are introverts.

(a) At a meeting of 15 marketing personnel, what is the probability that 10 or more are extroverts?
What is the probability that 5 or more are extroverts?
What is the probability that all are extroverts?

(b) In a group of 4 computer programmers, what is the probability that none are introverts?
What is the probability that 2 or more are introverts?
What is the probability that all are introverts?

The one-time fling! Have you ever purchased an article of clothing (dress, sports jacket, etc.), worn the item once to a party, and then returned the purchase? This is called a one-time fling. About 5% of all adults deliberately do a one-time fling and feel no guilt about it! In a group of nine adult friends, what is the probability of the following? (Round your answers to three decimal places.) Answer the following:

A. no one has done a one time fling

B. at least one person has done a one time fling

c. no more than two people have done a one time fling

Answer rating: 100% (QA)

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