A bottling machine fills soft drink bottles with an average of 12.000 ounces with a standard deviation of 0.002 ounces. Determine the process capability index, Cp, if the design specification for the fill weight of the bottles is 12.000 ounces plus or minus 0.015 ounces.
It says that the answer is 2.5; however, I have no clue how to approach the problem. If you can help me figure it out, I would very appreciate it)