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To ensure 5500 acceptable parts with a rejection rate of one-twelfth, you would need to tool 6000 parts.
To ensure 5500 acceptable ones, the number of parts that must be tooled can be calculated by considering the rejection rate of one-twelfth. Since one-twelfth of the parts are rejected, it means 11 out of 12 parts are acceptable. Therefore, you must tool 12 parts to get 11 acceptable ones (12/11) and to ensure 5500 acceptable parts, you would calculate: 5500 * (12/11) = 6000 parts that must be tooled.
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