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Prayerofhope

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a) What percent of the concrete roadway is under the minimum depth ?

b) The company's lawyers insist that no more than 3% of the output be under the limit. Because of the expense of operating the machine, they cannot afford to reset the mean to a higher value. Instead they will try to reduce the standard deviation to achieve the "only 3% under" goal. What SD must they attain?

c) Explain what achieving a smaller standard deviation means in this context.