Stevenson ( two hundred9) includes problem 15S-3 to determine the optimum preventive sustenance frequency for each of the pieces of equipment if breakdown is normally distributed (p.732) The table at a lower place provides the following given information:
EquipmentAverage time amidst breakdowns (Days)Standard DeviationPreventive Maintenance Cost crack-up Cost
A201202$300 $2,300
B400303$200 $3,500
C850404$530 $4,800
According to Stevenson (2009), an optimal maintenance time interval for equipment, given the modal(a) time between breakdowns and warning deviation, provides trading opeproportionns managers a decision-making tool for preventive maintenance with the longest practical use of facilities or equipment without a breakdown (p. 730).
Stevenson (2009) suggests first, using the ratio Preventive Cost/Breakdown Cost = Probability to preserve the cost of preventive maintenance to the cost of a breakdown repair, then determining z, i.e.
, the number of standard deviations from the mean and adding the average time between breakdowns, optimal maintenance intervals for each pillowcase of equipment would be:
EquipmentProbabilityZMean + Z = optimum Maintenance Interval
A201$300/$2,300 = .1301.1220 1.12(2) = 17.76 days
B400$200/$3,500 = .0571.5830 1.58(3) = 25.26 days
C850$530/$4,800 = .1101.2240 1.22(4) = 35.12 days
Instead of reading the z table values from the text, an online z-score calculator can be used to find the number of standard deviations from the mean, given a probability ( ordinance Lab, n.d.).
References
Formula Lab. (n.d.). Z-score calculator [online application]. Retrieved from Formula Lab website http://www.fourmilab.ch/rpkp/experiments/analysis/zCalc.html
Stevenson, W. (2009). Operations Management (10th ed.). newly York, NY: McGraw-Hill.If you want to get a full essay, order it on our website: Ordercustompaper.com
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