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12 July, 03:25

For 120 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 8 bottles. The average across all 960 bottles (120 days, 8 bottles per day) was 46 degrees Fahrenheit. The standard deviation across all bottles was 0.8 degree. When constructing an X-bar chart, what would be the center line?

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  1. 12 July, 03:44
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    Answer: 46 degrees Fahrenheit

    Explanation: Center line is an X double bar which is average across all components. Here it is already given that te average across all 960 bottles (120 days, 8 bottles per day) was 46 degrees Fahrenheit.

    There is no need to solve since it's already given therefore the Centre line is 46 degrees Fahrenheit.
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