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

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): You can put this solution on YOUR website!

 

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 

RELATED QUESTIONS

if a new drug has been found to be effective 40% of the time, then what is the... (answered by Theo)
A new drug has been found to be effective in treating 75% of the people afflicted by a... (answered by addingup)
A new drug has been found to be effective in treating 70% of the people afflicted by a... (answered by stanbon)
A new drug has been found to be effective in treating 70% of the people afflicted by a... (answered by macar)
An experimental  drug has been shown to be 75% effective in eliminating symptoms of... (answered by ewatrrr)
An experimental drug has been shown to be 75% effective in eliminating symptoms of... (answered by ikleyn)
a machine is packaging nominal weight is 800 grams packets and it has been found that... (answered by ikleyn)
Please help me solve this question: The concentration (in milligrams per milliliter) of a  (answered by Alan3354)
A new drug has been shown to be 80% effective at relieving restless leg syndrome. If the... (answered by Fombitz)