Good afternoon, please help me answer problem below. Need to understand problems like this . Step by step

Problem 8: The US Mint is assessing its process capability for minting dimes. In regard to weight, the upper specification is 2.274 grams and the lower specification is 2.266 grams. The process is not centered at the specification mean. The process mean is 2.271 grams with a standard deviation of 0.0005 grams. If the upper and lower control limits are three standard deviations from the process mean, what is the process capability index