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VitaComp manufactures non-pharmaceutical pills and pellets from dry ingredients, using a collection of machinery it maintains in a large job shop. Machine AA-23 molds circular pellets to an average diameter of 65 mm, with normally distributed natural variation expressed by a 1 mm standard deviation when the machine is in control. VitaComp has just agreed to mold a batch of plant food pellets of the 65mm design. To monitor the plant food job, it will sample 100 pellets randomly each hour, and chart their average diameter on a mean chart prepared for this purpose, using a z-value of 1.67. What is the Upper Control Limit of the mean chart described here?
a. 64.9833mm
b. 65.00mm
c. 66.67mm
d. 65.167mm
e. 63.33mm

Sagot :

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