Historically,the Average Time to Service a Customer Complaint Has Been

Multiple Choice

Historically,the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day.Management would like to specify the control limits for an chart with a sample size of 10- and 3- sigma limits.The LCL for the chart would be:

A) less than 2.40.
B) greater than 2.40 but less than or equal to 2.45.
C) greater than 2.45 but less than or equal to 2.50.
D) greater than 2.50.