Mean of whole Image

Greetings!

I am trying to get the mean of the whole image in SNAP but I just get min-max values of the image under colour manipulation window. I tried using band math but it returns the pixel-wise Mean. while I am interested in getting the mean of the entire image.

Thanks in advance

You can use the statistics tool (the Epsilon sign in the toolbar) to display mean, median ect

thanks a lot