It does say that histograms are not available for all measures. Your measure must be one of the exceptions. I have done histograms on calculated fields, but I think they are not available for certain table calculations.
If you want, you can attach a workbook with sample/dummy data and perhaps there is another way of doing what you would like to achieve...
Hope that helps,
I too am trying to figure this out. I am using a calculated field averaging clock-times. The calculation is based on 2 fields with numerical data:
The option for "Create Bin" is not available in that calculated field.
While this doesn't give you the full use of a Bin, you could create another (or modify your existing) calc field to use the "Round" function. This would put your values for sum([total_time])/sum([grand_total]) into "bin" like segments.
let's say you wanted the values to increment every .5
you could also create a parameter that to dynamically change the increments
round((sum([total_time])/sum([grand_total]))/([numeric parameter]),0)*([numeric parameter])