A murder scene is found with two types of blood - that of the victim and that of the murderer. As luck would have it, the unidentified blood has an incredibly rare blood disorder, only found in 1 in every million men. The capital and surrounding areas have a population of 20 million - and the police are sure the murderer is from the capital. The police have already started cataloging all citizens' blood types for their new super crime-database. They already have nearly 1 million male samples in there - and bingo - one man, Mr XY, is a match. He is promptly marched off to trial, there is no other evidence, but the jury are told that the odds are 1 in a million that he is innocent. He is duly convicted. The question is, how likely is it that he did not commit this crime?
A murder scene is found with two types of blood - that of the victim and that of
the murderer. As luck would have it, the unidentified blood has an incredibly rare
blood disorder, only found in 1 in every million men. The capital and surrounding
areas have a population of 20 million - and the police are sure the murderer is
from the capital. The police have already started cataloging all citizens' blood
types for their new super crime-database. They already have nearly 1 million
male samples in there - and bingo - one man, Mr XY, is a match. He is promptly
marched off to trial, there is no other evidence, but the jury are told that the odds
are 1 in a million that he is innocent. He is duly convicted. The question is, how
likely is it that he did not commit this crime?
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