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Beginners help with ISO3951-2 Combined control s-method n>5 what is Phi ??

#1
Hi All,

I'm new to 3951 and have been working through the examples in the standard. I have been looking at
16.3.2.5 Combined control for the s-method with n≥5 — Approximative method.
In trying to determine the process fraction non-conforming I cannot understand the example calculation at the point where Pu=Phi(tu)=0.11577 as shown on page 23 of the standard.

Where has the value for Phi come from ??.

Any help would be grateful received.

Many thanks
 
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