Oh! Oh! I know this one Took forever to find it on stackoverflow Mkay So you want a bell curve with 0.5 most often, and near 0 or 1 to be rarer This is how (RND()+RND())/2 for a little bit of focus on 0.5 (RND()+RND()+RND())/3 for more focus on 0.5 (RND()+RND()+RND()+RND())/4 for more focus on 0.5 and near 1 or 0 to be way way more rare ...and so on