SOLUTION: When treated with an Antibiotic, 91% of all the dolphins are cured of an ear infection. If 5 dolphins are treated, find the probablity that exactly 4 are cured?
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-> SOLUTION: When treated with an Antibiotic, 91% of all the dolphins are cured of an ear infection. If 5 dolphins are treated, find the probablity that exactly 4 are cured?
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Question 471567: When treated with an Antibiotic, 91% of all the dolphins are cured of an ear infection. If 5 dolphins are treated, find the probablity that exactly 4 are cured? 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(cured) =.91 and q = .09
nCx =
5 dolphins treated n = 5
P(exactly 4 cured) = 5C4(.91)^4(.09) = 5(.91)^4(.09)= .3086
