Performance Average (Robust) operator

Hello,

I am performing a manual 5 fold cross validation where I manually divided the datasets into 5 folds. I applied an algorithm (Decision Tree) and now I have 5 performances, if I use performance average (Robust) it will give the average of all the performances, but I saw (help window) that it removes the highest and lowest performance value, this should not happen in my case as I want all the performances in 5 folds to be averaged. Is there any other way I can average the outputs of performance operators?

Thanks for your help.