Question for Chapter 3: (Bitbucket import 2011-08-03)

[kgdunn]

Multiple sources of variation (e.g. temperature control of propellant)

Equipment-to-equipment variation: \sigma=40mg (multiple machines produce the product)
Temperature: \sigma=32mg
Calibration variation: \sigma= 15mg
Wear and tear: \sigma=10mg
Question: what is the overall process variation (sigma= .... mg) at the end of the line; what assumptions do you have to make to calculate this variation?