The average number of defective parts manufactured during a shift at a technology factory is supposed to be under 30 defectives a shift.  Shift A averages 28.6 defectives per shift with a standard deviation of 5.6 defectives. Shift B averages 26 defectives per shift with a standard deviation of 2.4 defectives. Shift C averages 25 defectives per shift with a standard deviation of 8.4 defectives.  Which shift appears to be doing the best job?

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