Question: For 10 consecutive days, a process engineer has measured the temperature of water bottles as they are made ready for serving. Each day, she took

For 10 consecutive days, a process engineer has measured the temperature of water bottles as they are made ready for serving. Each day, she took a sample of 9 bottles. The average across all 90 bottles (10 days, 9 bottles per day) was 45 degrees Fahrenheit. The standard deviation across all bottles was 1.8 degree. When constructing an X-bar chart, what would be the center line, upper and lower control limits?

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