cumulative probability limit factor product distribution function sigma-cum-product(phi-cum-product) deisenroth = σcp(ϕcp;n;σd) = σd^(±√(-ln(2^n*ϕcp)/n)) = σxgeo*sd = sigma(xgeo*sd) = xgeo*sd(ϕcp;n)= cumulativ confidence limit factor product deisenroth = x(ϕcp;n;σd)/µ= x(ϕ;n;σ)/µ or µ/x(ϕ;n;σ)