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According to a survey by TD Ameritrade, one out of four investors has exchange-traded funds in...

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Basic Math

According to a survey by TD Ameritrade, one out of fourinvestors has exchange-traded funds in their portfolios (USAToday, January 11, 2007). Consider a sample of 40investors.

Compute the probability of exactly 7 investors havingexchange-traded funds in their portfolio.

Compute the probability that at least 5 of the investors haveexchange-traded funds in their portfolio.

Compute the probability that at most 4 of the investors haveexchange-traded funds in their portfolio.

Find the mean and standard deviation.

If you found that exactly 10 of the investors haveexchange-traded funds in the

portfolio would you doubt the accuracy of the survey andwhy?

Answer & Explanation Solved by verified expert
3.6 Ratings (297 Votes)
n 40 p 14 025 It is a binomial distribution PX    See Answer
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