Calculate the mean Pixel Value of each class in %

[sytsedevries]

I have a File Geodatabase Raster layer with a pixel value of 0 - 38.

I want to know the mean of each class in %

For example what is the mean of the class 1 - 5 

0 - 1%  --> ?mean%

1 -5%  --> ?mean%

5- 10% -->?mean%

< 10%  --> ?mean%

What is the best way to calculate the average of each class in %?

NOT IN AREA, BUT IN %

[LRMInfoSection]

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