Question 296705: A manufacturer of headache medicine claims it is 70% effective within a few minutes. That is, out of every 100 users, 70 get relief quickly. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief in a few minutes?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A manufacturer of headache medicine claims it is 70% effective within a few minutes. That is, out of every 100 users, 70 get relief quickly. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief in a few minutes?
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Binomial Problem with n = 12 and p = 0.7
P(x=8) = 12C8(0.7)^8*(0.3)4 = 0.2311..
Cheers,
Stan H.
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