SOLUTION: In a certain group of students, the probability that a student have experienced chickenpox is 0.7 and the probability of haven�t experienced it yet is 0.30. If 5 students are rando

Question 395683: In a certain group of students, the probability that a student have experienced chickenpox is 0.7 and the probability of haven�t experienced it yet is 0.30. If 5 students are randomly selected with replacement, what is the probability that exactly one of them have experienced chickenpox?
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 = .7 q =.3

nCx = 

P(1 of 5 have had chicken pox) =  5(.7)^1(.3)^4 = .0284 

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