Chart demonstrates the distribution
in your own case

Here you can download an advanced Excel-tool for process capability calculations. Tool can manage up to 100 samples and shows estimated C_pk, C_p and Yield. It also presents a chart showing the samples as well as estimated distribution (assuming that distrubution is normal).
This tool is for demonstration and training purposes only. For safety reasons no macros are used.

The available version is 1.3. You can select from three alternatives:

1. Tool 10. Up to 10 samples. Free. Good to try this first.
    
2. Tool 50. Up to 50 samples.
   Buy from secured online store (Simplegoods.co & Stripe.com).
    
3. Tool 100. Up to 100 samples. User can modify this version for own purposes (unprotected file). Buy from secured online store (Simplegoods.co & Stripe.com).