SOLUTION: Students who bought iPod devices complained about having received defective iPods. The industry standard for such devices has been two percent defective devices. In a sample of 12

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Question 1166288: Students who bought iPod devices complained about having received defective iPods. The
industry standard for such devices has been two percent defective devices. In a sample of 120
units sold, 6 units were defective.
Required:
a) Compute the proportion of defective items in the sample. (2)

how do i tackle this question
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The defective proportion is 6/120 or 5%. That is what was asked for. Below is the probability of that's occurring given a 2% error rate.

prob of 6 in a binomial with probability of 0.02 failure is 120C6*0.98^114*0.02^6=0.0234