Problem
Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age. Round your answer to the nearest tenth. \[ \begin{array}{lll} 53 & 67 & 63 \\ 50 & 67 & 58 \\ 60 & 50 & 52 \end{array} \] 57.8 58.0 57.1 56.5
Solution
Step 1 ：\( {Sum} = 53 + 67 + 63 + 50 + 67 + 58 + 60 + 50 + 52 \)
Step 2 ：\( {Sum} = 520 \)
Step 3 ：\( {Mean} = \frac{Sum}{Number\,of\,employees} = \frac{520}{9} = 57.78\dots \)
Step 4 ：\( {Rounded\,Mean} = 57.8 \)
