Using a sample of 100 items the average process output is 4.5 with a sample standard deviation of 0. The LSL = 2.0 and the USL = 6. Calculate the...

Using a sample of 100 items the average process output is 4.5 with a sample standard deviation of 0.5. The LSL = 2.0 and the USL = 6.0. Calculate the process capability index value. Not sure if I am on the right track with this one, but I arrived at an answer of CP=1.33. The formula I used was Cp= (USL-LSL)/(6*0.5)= 1.33. Management wouldn't need to make any adjustments because this is within the tolerable range. Can you let me know if I applied this correctly?