How to find the mean of data contained in a column of a table?

i want the mean of the values stored in a column of a table. how can i do that?

For example :

                 1      11

                 2      22

                 3      33

                 4      44

                 5      55

is the column data. how to find mean of this both columns and store them in a variable.

Answer 1

[A Jenkins]

a=[1 11; 2 22; 3 33; 4 44; 5 55]
b=mean(a)

b =

     3    33

Answer 2

[Azzi Abdelmalek]

A=[1 11; 2 22;3 33;4 44;5 55]
out=mean(A)