What is the average run length (ARL)until an 
control chart signals a false alarm if the control limits are set at ±3 standard errors from the centerline?
Definitions:
Net Price
The price of a good or service after all discounts, rebates, and other cost reductions have been applied, not including additional charges such as shipping or taxes.
Complement Method
A mathematical technique used to simplify the process of subtraction by utilizing the "complement" of a number.
Cash Discount
A reduction in an invoice amount available to the buyer for paying all or part of the amount due within a stated period of time.
Invoice Date
The date stated on an invoice; the beginning of the discount period.
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