Review the information below and select the best choice.  Select only one choice.   ±σ Mean Time Between Failures Six .002 Five 0.57 Four 63 Three 2700   Assumme an electronic system at a nuclear facility is being monitored constantly, and it is currrently rated to have two milllion hours between failures.  This implies that the electronic system is operating at: a. better than or equal to six sigma. b. between five and six sigm

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