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Probability and Normal Distribution

A packaging company distributes quarter-pound beef patties to local fast-food restaurants. The restaurants demand the weights to be 4 plus or minus .02 ounces. If the patties are too small the customers will complain, if there will be too few of them in each box and the company will loose money. if the standard deviation of the patties is .009, what percentage of the patties will not meet the expectations?

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