two simple Questions needs to be answeres

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Overall Equipment Effectiveness (OEE)

 

Study Ch 8 pp. 248-261 (2nd edition) or pp. 264-278 (3rd edition), then review PPt lecture for this module, and, then answer the following questions:

 

 

     a) What is the rationale for using the coefficient of variation c instead of the standard deviation σ as a measure of variability?
     b) Why use Utilization for existing equipment in operation and OEE for new proposed plant equipment?
 
HERE is the book:
Hopp, Wallace J., and Spearman, Mark L. Factory Physics. 3rd ed.
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