The defect rate for your product has historically been about 1.00%. For a sample size of 400, the upper and lower 3-sigma control chart limits are: UCLp =

Lower limit = -0.05 and Upper limit = 0.025

Step-by-step explanation:

3-sigma , p chart control limits:

Lower limit =

Upper limit = , where n= sample size .

Given: p= 0.01 , n= 400

Lower limit =

Upper limit=

hence, Lower limit = -0.05 and Upper limit = 0.025

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