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 $6$ bottles. The average across all $720$ bottles $(120$ days, $6$ bottles per day$)$ was $58$ degrees Fahrenheit. The standard deviation across all bottles was $\mathrm{.}5$ degrees Fahrenheit.

When constructing an X$-$bar chart, what would be the center line?

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 $6$ bottles. The average across all $720$

bottles $(120$ days, $6$ bottles per day$)$ was $58$ degrees Fahrenheit. The

standard deviation across all bottles was $\mathrm{.}5$ degrees Fahrenheit.

When constructing an X$-$bar chart, what would be the center line?