MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

According to a survey conducted by TD Ameritrade, one out of four investors have exchange-traded funds in their portfolios (USA Today, January 11, 2007). Consider a sample of 20 investors.

a. Compute the probability that exactly 4 investors have exchange-traded funds in their portfolios.

b. Compute the probability that at least 2 of the investors have exchange-traded funds in their portfolios.

C. If you found that exactly 12 of the investors have exchange-traded funds in their port- folios, would you doubt the accuracy of the survey results?

d. Compute the expected

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