2.99
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A restaurant critic goes to a place twice. If she has an unsatisfactory experience during both visits, she will go once more. Otherwise she will make only the two visits. Assuming that the results for different visits are independent and that the probability of a satisfactory experience in any one visit is .7

(a) Assign probabilities to each outcome.

(b) Find the probability of at least two unsatisfactory visits.

(c) Find the conditional probability of at least one satisfactory visit given at least one unsatisfactory visit.