Last year nine employees of an electronics company retired T

Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find
the mean retirement age.
53 67 62
51 64 58
64 54 54
A) 58.6 B) 57.9 C) 58.0 D) 57.3

Solution

Getting the mean, X,      
      
X = Sum(x) / n  

As, adding them,
  
Sum(x) =    527  

As n =    9  

Thus,      

X =    58.55555556 = 58.6 [ANSWER, OPTION A]