Question: l Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed: (Round Probability Ratio to 4

Determine the optimum preventive maintenance frequency for each of the pieces of equipment if breakdown time is normally distributed: (Round "Probability Ratio" to 4 decimal places, and all other answers to 2 decimal places. Negative values should be inclicated by a minus sign.) Use Iable. Cllick here for the Excel Data File Table B 1. Areas under the standardiced nomal curve, from to z
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