Question: The average time to service a customer has been 3 days and the standard deviation has been 0.50 days. Management would like to specify the

The average time to service a customer has been 3 days and the standard deviation has been 0.50 days. Management would like to specify the control limits for an X-bar chart with a sample size of 4, and 3 sigma limits. The LCL for the chart would be:

1. Less then 2.40

2. Greater than 2.40 but less than or equal to 2.45

3. Greater than 2.45 but less than or equal to 2.50

4. Greater than 2.50

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