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An American Association of Individual Investors (AAII) survey found that 25% of AAII members had purchased...

An American Association of Individual Investors (AAII) survey found that 25% of AAII members had purchased shares of stock directly through an Initial Public Offering (IPO). From a random sample of 15 AAII members, (Give answers to four decimal places.)

a) what is the probability that exactly 4 had purchased IPO’s?

b) what is the probability that between 3 and 9 had purchased IPO’s?

c) what is the probability that at least one had purchased IPO’s?

Math   Statistics-And-Probability   
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