Mean and Standard deviation of matrix elements

Questions
1

Hi everyone;
I wanted to take the mean and std dev of matrix elements or data as table form.
I got a command line like this:
Z2 = Pick[Z1, Table[If[OddQ[i + j], 1, 0], {i, 1, 201}, {j, 1, 201}], 1] // TableForm
and want to have Mean[Z2] and StandardDeviation[Z2].
Thanks

2

You probably want to leave TableForm out of Z2, because it interferes with further calculations:

(Z2 = Pick[Z1, Table[If[OddQ[i + j], 1, 0], {i, 1, 201}, {j, 1, 201}],
     1]) // TableForm

To get the Mean and StandardDeviation you need to Flatten Z2 first, unless you want the means of the columns separately:

Mean[Flatten[Z2]]