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Back to 4.4 Problems on Independence of Events

4.4 Exercise 10

Avg difficulty 2.5

David, Mary, Joan, Hal, Sharon, and Wayne take an exam in their probability course. Their probabilities of making 90 percent or more are

0.720.830.750.920.650.790 . 72 0 . 83 0 . 75 0 . 92 0 . 65 0 . 79

respectively. Assume these are independent events. What is the probability three or more, four or more, five or more make grades of at least 90 percent?

Pfeiffer, Applied Probability, 4.4 Problems on Independence of Events, exercise 10

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Adapted from Applied Probability © 2009 Paul E. Pfeiffer. Licensed under CC BY 3.0. Source: Applied Probability. Imported at revision d7a0420.