>>3632426That depends on your standards and what you consider a keeper. To me, a useable shot is not a keeper. A keeper is a shot that I spend hours in the darkroom to get a perfect print of. A useable shot is one that I maybe spend half an hour or an hour to get a good print of to show to others.
A keeper rate of 5 % is actually good.
Personally, my highest rate of useable shots per roll was 11, among which I had 2 keepers (image related is useable, but no keeper).