SOLUTION: After studying Mr X'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 Mr X has three childr

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Question 1192115: After studying Mr X'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 Mr X has three children, what is the probability that exactly two of the children have the gene for disease X?

Answer by ikleyn(52794)   (Show Source): You can put this solution on YOUR website!
.
After studying Mr X'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 Mr X has three children,
what is the probability that exactly two of the children have the gene for disease X?
~~~~~~~~~~~~~~

Standard binomial distribution problem. 

    P =  =  = 0.1406  (rounded).    ANSWER

Solved.

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To see many other similar  (and different)  solved problems,  look into the lessons
    - Simple and simplest probability problems on Binomial distribution
    - Typical binomial distribution probability problems
in this site.

Learn the subject from there.



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