The operation manager of a delivery company collects 9 delivery samples of size 5 to make control charts. The average delivery time among all samples is 12 minutes. From past studies, she knows that the delivery times have a standard deviation of 3.0 minutes. 

Compute the Upper Control Limit (UCL) for an x-bar chart with 3 sigmalimits (i.e., with confidence level 99.73%).

 

Note:

1- Only round your final answer. Round and enter your final answer with 2 decimal places.