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CSS General Science & Ability Paper 2016
Q.No.12 (a) Classification of blood groups is based on the presence or absence of inherited antigenic substances on the surface of red blood cells. In a survey of British population the blood group distribution among 1000 people was as follows: 300 has blood group A, 325 had blood group B, 250 had O and 125 AB. Out of this group a person was selected at random, calculate his probability of having blood group AB.

Solution

Here, Total Events (No: of people sampled) = 1000
People with Blood Group A = 300
People with Blood Group B = 325
People with Blood Group O = 250
People with Blood Group AB = 125

Thus,