find the probability P₁ that at least 9 out of 11 patients will recover.

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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How was the correct answer of 0.6174 attained?

Historical statistics showed that every person infected by a virus will recover independently with probability 0. 8. A medicine
company has developed a new medicine for treatment of this infection. To test the effectiveness of the medicine, the company
selected at random 11 patients infected by the virus and treated with the medicine. 9 patients recovered shortly thereafter.
Assume the medicine is completely ineffective,
1. find the probability P₁ that at least 9 out of 11 patients will recover.
P1 0.6174
=
Transcribed Image Text:Historical statistics showed that every person infected by a virus will recover independently with probability 0. 8. A medicine company has developed a new medicine for treatment of this infection. To test the effectiveness of the medicine, the company selected at random 11 patients infected by the virus and treated with the medicine. 9 patients recovered shortly thereafter. Assume the medicine is completely ineffective, 1. find the probability P₁ that at least 9 out of 11 patients will recover. P1 0.6174 =
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