Two antigens, antigen A and antigen B, determine the four major human blood groups: A, B, AB, and O. The table below shows the percentage distribution of blood groups for the Caucasian population in the United States (American Red Cross, 2016). Blood group Antigen A B AB 0 A B A, B None Distribution 40% 11% 4% 45% Calculate the probability of randomly picking a blood sample that does not contain antigen A, that is, a blood sample that belongs to either blood group B or blood group O. Give your answer as a whole number percentage. Probability= % American Red Cross. Blood Types. http://www.redcrossblood.org/learn-about-blood/blood-types (accessed July 27, 2016).