Binomial distribution-legal speed limit

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  Our authors state that the underlying statistical distribution for a p-chart (yes-no attribute) is Binomial....BUT.....for large samples can be approximated by a Normal (bell-shaped) distribution! Why is this true?

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  of 0.5 from the lower limit is the continuity correction.)

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  She has therefore asked for a control chart that shows how often the average speed has exceeded the proposed upper limit for contractual performance.

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