SOLUTION: After studying a couple's family history, a doctor determines that the probability of any child born to this couple having a gene for disease X is 1 out of 4. If the couple has th

Algebra ->  Probability-and-statistics -> SOLUTION: After studying a couple's family history, a doctor determines that the probability of any child born to this couple having a gene for disease X is 1 out of 4. If the couple has th      Log On


   

Question 1105973: After studying a couple's family history, a doctor determines that the probability of any child born to this couple having a gene for disease X is 1 out of 4. If the couple has three children, what is the probability that exactly two of the children have the gene for disease X?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
P=(3C2)(1/4)^2*(3/4)^1
=3*(1/16)*(3/4)
=9/64