Find the Mean for the Given Sample Data $$\begin{array} { l l l } 52 & 63 & 67 \\50 & 59 & 58 \\65 & 51 & 56\end{array}$$

Multiple Choice

Find the mean for the given sample data. Unless indicated otherwise, round your answer to one more decimal place than is present in the original data values.
-Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age. $$\begin{array} { l l l } 52 & 63 & 67 \\50 & 59 & 58 \\65 & 51 & 56\end{array}$$

A) 57.9 yr
B) 56.6 yr
C) 58.0 yr
D) 57.3 yr