Question: In order to efficiently bid on a contract, a contractor wants to be 92% confident that his error is less that 0.8 hours in estimating

In order to efficiently bid on a contract, a contractor wants to be 92% confident that his error is less that 0.8 hours in estimating the average time it takes to install tile flooring. Previous contracts indicate that the standard deviation is 5.2 hours. How large a sample must be selected

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