Question: PA 9-7 For 120 consecutive days, a process engineer... For 138 consecutive days, a process engineer has measured the temperature of champagne bottles as they

PA 9-7 For 120 consecutive days, a process engineer...

For 138 consecutive days, a process engineer has measured the temperature of champagne bottles as they are made ready for serving. Each day, she took a sample of 9 bottles. The average across all 1242 bottles (138 days, 9 bottles per day) was 51 degrees Fahrenheit. The standard deviation across all bottles was 1.4 degrees.
(Round your intermediate calculations and final answer to 4 decimal places.)
When constructing an X-bar chart, what would be the upper control limit?

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