Two anti-congestant drugs (A and B) are trialled on a group of 15 patients with chronic asthma. Supposing the two drugs are equally effective, the probability that a patient experiences a greater increase in Peak Expiratory Flow (PEF) with drug A than with drug B is 0.5. What is the probability of 10 or more patients in the trial experience a greater increase in PEF with drug A?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Two anti-congestant drugs (A and B) are trialled on a group of 15 patients with chronic asthma. Supposing the two drugs are equally effective, the probability that a patient experiences a greater increase in Peak Expiratory Flow (PEF) with drug A than with drug B is 0.5.

What is the probability of 10 or more patients in the trial experience a greater increase in PEF with drug A?
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