SOLUTION: a) Out of every 100 jobs received at a computer center, 50 are of class 1, 30 of class 2 and 20 of class 3. A sample of 30 jobs is taken with replacement. i) Find the probabili

Question 271654: a) Out of every 100 jobs received at a computer center, 50 are of class 1, 30 of class 2 and 20 of class 3. A sample of 30 jobs is taken with replacement.
i) Find the probability that the sample will contain ten jobs of each class.
ii) Find the probability that there will be exactly twelve jobs of class 2.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
i)
(50C10 * 30C10 * 20C10)/100C30
=(1.027*10^10 * 30045015 * 184756)/2.937*10^25
=.0019
.
(30C12 * 70C18) / 100C30
=(86493225 * 2.319*10^16)/2.937*10^25
=.0683
.
Ed
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