1 Normal 1 No Spac... Heading 1 Heading 2 Title Subtitle Subtle Em. Styles A sample is selected from one of two populations, $1 and $2, with probabilities P(S1) = 0.80 and P($2) = 0.20. If the sample has been selected from S1, the probability of observing an event A is P(A | $1) = 0.15. Similarly, If the sample has been selected from $2, the probability of observing A is P(A | $2) = 0.25. Round your answer to four decimal places, if necessary a. If a sample is randomly selected from one of the two populations, what is the probability that event A occurs? If a sample is randomly selected and event A is observed, what is the probability that the sample was selected: b. From population S1? c. From population S2? Focus 2"C Most