A Machine Which Manufactures a Part for a Car Engine

Short Answer

A machine which manufactures a part for a car engine was observed over a period of time before a random sample of 300 parts was selected from those produced by this machine. Out of the 300 parts, 15 were defective.
Find the proportion of defective parts in the sample.
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Is the sampling distribution of the proportion of defectives approximately normal?
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What is the mean?
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What is the standard deviation?
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What is the probability that the sample proportion will lie within 0.02 of the true population proportion of defective parts?
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