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    Standard deviation sample size for lifetime of washing machines

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    The standard deviation of the lifetime of washing machines is estimated to be 800 hours. How large a sample must be taken in order to be 97% confident that the margin of error will not exceed 50 hours?

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    https://brainmass.com/statistics/quantative-analysis-of-data/standard-deviation-lifetime-washing-machines-large-sample-376591

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