An e-commerce website has received some complaints on packaging errors. Managers ask the shipping and handling department to monitor the shipping process and make sure of the quality in their process. To monitor the process, for 10 consecutive weeks, they look into the first 100 shipments and count the number of packaging errors as shown in table below:

Week12345678910 Number of packaging errors4165232413

Construct a two-sigma limit control chart to show whether the shipping process in this e-commerce firm needs any improvement or performs at an acceptable level. (Round your answer to three decimal places.)

Upper Control Limit:

Lower Control Limit: