Human blood types are typically classified by the ABO blood group and the Rh blo

Question

Human blood types are typically classified by the ABO blood group and the Rh blood group systems. Each individual has a blood type consisting of a combination of A, B, AB, or O from the ABO blood group and either + or - from the Rh blood group (for example, blood type B-. Blood types are an inherited trait and the proportion of each blood type will vary from region to region. Complete the contingency table for the probability of each blood type using the Venn diagram of the blood types for 1000 randomly sampled individuals from Israel.

Explanation / Answer

You have perhaps done everything right except that you have found the frequency instead of the probability . You just had to divide each frequency by the total sample size that is 1000. Therefore the contingency table would be:

This is the required probability table. They are computed as:

for example for A+,

P(A+) = number of elements in A+ / Total sample size = 361 /1000 = 0.361

Similarly all other are computed.

A B AB O Rh+ 0.361 0.153 0.078 0.288 Rh- 0.052 0.025 0.013 0.030

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