23) A blood bank records the blood types, including positive or negative Rh-factor, during a blood drive. The table shows the number of donors with each type of blood. Blood Type O Total Positive 146 134 331 Rh-Factor Negative Total 172 160 400 a) Find the probability a donor chosen at random has type O or AB blood ,1825 A Find the probability a donor chosen at random has type A blood or is Rh-positive