30% of chicken is contaminated, if a person buys 12, what's the possibility that 6 of them are contaminated? thanks

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- March 7th 2009, 12:07 PMKalynUrgent help for statistics please!
30% of chicken is contaminated, if a person buys 12, what's the possibility that 6 of them are contaminated? thanks

- March 7th 2009, 12:16 PMrunning-gag
Hi

Let X be the random variable which counts the number of chickens contaminated out of 12.

X follows a binomial distribution (with parameters n=12 and p=0.30) because it is the number of "yes" in a sequence of 12 independent yes/no experiments (contaminated / not contaminated).

Therefore

- March 7th 2009, 12:27 PMKalynI don't get this
- March 7th 2009, 12:31 PMrunning-gag