The cycle times for an electroplating machine are believed to be normally distributed. Twenty-one plating operations are randomly sampled for time to cycle. The sample average cycle time is 10.21 minutes with a standard deviation of 0.59 minutes. Construct a 95% confidence interval on the mean cycle time for this machine. a. (9.911, 10.509) O b. (8.979, 11.441) O c. (9.958, 10.462) Od. (9.941, 10.479)

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