The Arabic language has very complex structures and different behavior, where instead of moving a letter to another letter like English language, it moves to a diacritic. Data analysis studies of a language are essential in numerous fields of knowledge, like Education. linguistics, Computers and Communications.The aim of this paper is to study the probabilities of letters in the Arabic frequencies statistics based on holly Quran sharif words sample Then deduced and compared with corresponding values for Markov chains.