The charge-to-tap time (min) for a carbon steel in one type of open hearth furnace was determined

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The charge-to-tap time (min) for a carbon steel in one type of open hearth furnace was determined for each heat in a sample of size 46, resulting in a sample mean time of 382.1 and a sample standard deviation of 31.5. Calculate a 95%

upper confidence bound for true average charge-to-tap time.

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