For 126 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 6 bottles. The average across all 756 bottles (126 days, 6 bottles per day) was 57 degrees Fahrenheit. The standard deviation across all bottles was .5 degrees Fahrenheit. When constructing an X-bar chart, what would be the upper control limit