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posted by  02 Grand Prix on 10/12/2008 9:22:30 PM  |  status: Live  

Stastics

Course Textbook Chapter Problem
Statistics and Probability Elementary Statistics. johnson/Kuby, 10th Ed N/A N/A
Question Details:
In testing a new drug, researchers found that 5% of all patients using it will have a mild side effect.  A random sample of 11 patients using the drug is selected.  Find the probability that exactly two will have this mild side effect.

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posted by Kabuto on 10/12/2008 10:37:37 PM  |  status: Live
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02 Grand Prix's comment:
"Thanks..it makes sense now!"
Response Details:
Let X be the event the patient will have a mild side effect
 
Pr(X) = 0.05
 
You want to find Pr(X=2)
 
Pr(X=2) = 11C2 * (0.95)^9 * (0.05)^2 = 0.0867
 
 
Good luck!
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