Defective Cell Phones

A simulation of the manufacture of 500 cell phones was conducted and the number of defective phones was recorded. The manufacturing process has a defect rate of2%. The results of the simulation showed that of the 500 phones, 485 phones were good, and 15 were defective.
A. Is the percentage of defective cell phones from the simulation reasonably close to the value of 2%?

B. The simulation has been repeated 3 more times with the results shown below. Based on the results, would it be unusual to randomly select 500 such cell phonesand find that none of them are defective?

RESULTS: Good: 487 Defective:13
Good: 491 Defective: 9
Good: 495 Defective: 5


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