document.write( "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) )? \n" ); document.write( "

Algebra.Com's Answer #489578 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Note: The probability of x successes in n trials is: 
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document.write( "P = nCx*  where p and q are the probabilities of success and failure respectively. 
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document.write( "In this case p= .75  & q = .25
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document.write( "nCx = 
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document.write( "P(3 out of 5) =  = .2637 \n" );
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