a. As I understand, we select one person randomly from "us" and ask him/her whether he/she believes that college is not a good investment. If he/she says "yes" then the event A occurs. If says "no" then "not A" occurs.
b. If the person is chosen randomly then the probability of A, P(A) = 10% = 0.1.
Please ask if anything is unclear.
Jun 12th, 2015
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