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Unformatted text preview: Sharons Statistics Exam #2 Notes Example Problems and Application 1) 1 letter is randomly selected from the word LOOL and 1 letter is randomly selected from the word SOOL. Find the probability that the same letter is selected from both words. 3/8 (or 37.5%) ; there are 3 letters in common out of total of 8. 2) Events A and B are mutually exclusive events defined on a common sample space. P(A) = 0.7 and P(A or B) = 0.11. Find P(B). A^B = empty set P(A or B) = P(A) + P(B) = 0.11 = 0.7 + P(B); P(B) = 0.4 3) A and B are mutually exclusive events and P(A) = 0.5 and P(B) = 0.8. Find P(A or B). A^B = empty set; P(A) = 0.5, P(B) = 0.11 P(A or B) = ? P(A or B) = P(A) + P(B) P(A) + P(A) = 1 P(B) + P(B) = 1 P(A) + 0.5 = 1 P(B) + 0.8 = 1 P(A) = 0.5 P(B) = 0.2 P(A or B) = 0.5 + 0.2 = 0.7 4) 80% of the applicants at Yogurtland have a college degree, 20% have at least 2 years experience in the yogurt industry, and 45% have both a college degree and 2 years experience in the yogurt industry. If an applicant is chosen randomly, find the 45% have both a college degree and 2 years experience in the yogurt industry....
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 Winter '09
 Staff
 Statistics, Probability

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