A Random Sample of 10 Waitresses in Darwin Revealed the Following

Essay

A random sample of 10 waitresses in Darwin revealed the following hourly earnings (in dollars, including tips): $$\begin{array} { | r | r | r | r | r | r | r | r | r | r | } \hline 19 & 18 & 15 & 16 & 18 & 17 & 16 & 18 & 20 & 14 \\\hline\end{array}$$ If the hourly earnings are normally distributed with a standard deviation of $4.5, estimate with 95% confidence the mean hourly earnings for all waitresses in Darwin.