why r so many people right handed?

Answer 1

The reason or reasons for hand (and foot, and eye) dominance are unknown. But hand dominance is definitely innate and hereditary, and is not a culturally-determined trait. (Although people can force young children to adopt the other hand, as used to be done in schools to make all children write, cut, etc. with the right hand.) The majority of the people in all human societies are right-handed.