SOLUTION: Over a long period of time a certain drug has been effective in 75% of the cases in which it has been prescribed. If a doctor is now administering this drug to five patients, what
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Question 813316: Over a long period of time a certain drug has been effective in 75% of the cases in which it has been prescribed. If a doctor is now administering this drug to five patients, what is the probability that it will be effective for three of them (P(x=3) )? Answer by ewatrrr(24785) (Show Source):
Hi,
Note: The probability of x successes in n trials is:
P = nCx* where p and q are the probabilities of success and failure respectively.
In this case p= .75 & q = .25
nCx =
P(3 out of 5) = = .2637