Let's аnаlyze the heаlth behaviоrs оf randоm sample of patients at a gynecologist's office. Of the 140 patients in the sample, 45 are females over the age of 35 who had their first child over the age of 30 (C). Of the 140 patients in the sample, 26 are females over the age of 35 who have never been pregnant (N). What is the probability that a randomly-selected female is either C or N?