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The quality management department at ESTCO-AM has conducted measurement on the durability of one of its products . The department measures the time to failure

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The quality management department at ESTCO-AM has conducted measurement on the durability of one of its products . The department measures the time to failure in minutes when applying a strong load. The table below shows 4 samples, each including 5 observations. What's the value of the upper control limit for the x-bar chart? O a. 3.76 O b. 4.68 O c. 2.55 0 d. 3.60 0 e. 1.00

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