An American Society of Investors survey found 30% of individual investors have used a discount broker. In a random sample of eight individuals, what is the probability that exactly three of them have used a discount broker? Round your answer to two decimals.

  part a) 0.1307           part b)  0.172               part c)  0.040

hope this helps!!   :)

answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following

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