A quality control inspector wishes to estimate the mean weight of bags of cement leaving a production line on a particul

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answerhappygod
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A quality control inspector wishes to estimate the mean weight of bags of cement leaving a production line on a particul

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A quality control inspector wishes to estimate the mean weight
of bags of cement leaving a production line on a particular day to
within 2 g at the 95% level of confidence. It is known that the
standard deviation of the weights remains fairly constant at 60 g.
How large a sample should the inspector take?
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