32 a. Find the probability that none of die selected adults say that they were t

Question

32

a. Find the probability that none of die selected adults say that they were too young to get tattoos. b. Find the probability that exactly one of the selected adults says that he or she was too young to get tattoos. c. Find the probability that the number of selected adults saying they were too young is 0 or 1. d. If we randomly select five adults, is one an unusually low number who say that they were too young to get tattoos? Tainted Currency Based on the American Chemical Society, there is a 0.9 probability that in the United States, a randomly selected dollar bill is tainted with traces of cocaine. Assume that eight dollar bills are randomly selected. a. Find the probability that all of them have traces of cocaine. b. Find the probability that exactly seven of them have traces of cocaine. c. Find the probability that the number of dollar bills with traces of cocaine is seven or more. d. If we randomly select eight dollar bills, is seven an unusually high number for those with traces of cocaine? Death of Taxes Based on a Bellowes survey of adults, there is a 0.48 probability that a randomly selected adult uses a tax preparer to file taxes. Find the probability that among

Explanation / Answer

Answer:

a).

n=8, p=0.9

Binomial distribution used.

P(X=x) = (nCx) px (1-p)n-x

P( x=8) = 0.4305

b).

P( x=7) = 0.3826

c).

P( x 7) = P( x=7)+P( x=8)

=0.3826+0.4305

=0.8131

d).

P( x=7)=0.3826 is > 0.05.

It is not unusually high.

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