I recently had an ovarian tumor removed the size of a golf ball and a half, is that the normal size for an ovarian tumor?

Can be. Ovarian growths can range from about grape size to more than a large watermelon. Most ovarian growths are fluid filled, related to the menstrual cycle and resolve spontaneously. Occasionally a growth may be solid or a mixture of fluid and solid- some of which need to be removed. Hope yours was ok.