what is the lower and upper control limit for a 3 sigma control chart. answer rounded to 3 decimals places for both answers please.

Strom out this scenario. XF Electronics is a new startup manufacturing high quality Interior panels for expensive cars using premium materials The manufacturing process is manual and based on the skill of the worker can result in some small scratches Management wants to use control charts to ensure the number of scratches does not get too high. The quality manager has examined 10 panels and recorded the number of scratches observed Panel Number of Scratches 1 3 4 2 1 10