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i need to find the 10%condition of this:

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The ten percent condition says that if np (where n is 75 and p is .33 for name brand chickens) is greater than or equal to 10 then we can consider this a normal approximation and not a binomial. So in the case of name brand chickens np=25 and in generic, 33.75 so both are normal approximations.
Hope that helps,