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 non are extroverts? what is the probability that 2 or more are introverts? what is the probability that all are introverts?

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Suppose approximately 80% 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 non are extroverts? 
what is the probability that 2 or more are introverts? 
what is the probability that all are introverts?

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