(a) What is the probability that of 10 laborers testing positive, 2 are cocaine users, 5 marijuana users, and 3 users of other drugs? (b) What is the probability that of 10 workers testing positive, all are marijuana users? (c) What is the probability that of 10 workers testing positive, none are cocaine users?
(a) What is the probability that of 10 laborers testing positive, 2 are cocaine users, 5 marijuana users, and 3 users of other drugs? (b) What is the probability that of 10 workers testing positive, all are marijuana users? (c) What is the probability that of 10 workers testing positive, none are cocaine users?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.8: Probabilities Of Disjoint And Overlapping Events
Problem 2C
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Transcribed Image Text:Based on the study conducted by DOLE in 2000, of 4 million laborers in the general
workforce, 0.8% tested positive for drugs. Of those testing positive, 22.5% were
cocaine users and 54.4% marijuana users.
(a) What is the probability that of 10 laborers testing positive, 2 are cocaine users, 5
marijuana users, and 3 users of other drugs?
(b) What is the probability that of 10 workers testing positive, all are marijuana users?
(c) What is the probability that of 10 workers testing positive, none are cocaine users?
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