SOLUTION: Among a group of 18 stocks, suppose that 9 will perform above average and the other 9 will perform below average. If you pick 4 stocks from this group, what is the probability that

Algebra ->  Probability-and-statistics -> SOLUTION: Among a group of 18 stocks, suppose that 9 will perform above average and the other 9 will perform below average. If you pick 4 stocks from this group, what is the probability that      Log On


   

Question 1204023: Among a group of 18 stocks, suppose that 9 will perform above average and the other 9 will perform below average. If you pick 4 stocks from this group, what is the probability that all 4 will be above average in performance?
Answer by ikleyn(52878) About Me  (Show Source):
You can put this solution on YOUR website!
.
Among a group of 18 stocks, suppose that 9 will perform above average
and the other 9 will perform below average.
If you pick 4 stocks from this group, what is the probability
that all 4 will be above average in performance?
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This problem is a TWIN to the problem solved 5 minutes ago under this link

https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1204025.html

The solution follows to the same logic. 

    P = C%5B9%5D%5E4%2FC%5B18%5D%5E4 = 126%2F3060 = 7%2F170 = 0.041176  (rounded).    ANSWER

Solved.

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To see many other similar  (and different)  problems solved,  look into the lesson
    - Elementary Probability problems related to combinations
in this site.

Learn the subject from there.