2.+-12 points My Notes Ask Your At the scene of a crime, the police have found a
ID: 3358589 • Letter: 2
Question
2.+-12 points My Notes Ask Your At the scene of a crime, the police have found a blood stain, a footprint, and some threads from a fabric. All are presumed to have been left by the person who committed the crime. After analyzing the evidence it is found that The blood type is a type found in only 15% of the population. The footprint is a size 13 men's shoe and only 8% of the population wears that shoe size. . Only 35% of the population owns clothing made from a fabric that matches the thread samples found at the scene The police have a suspect who matches all of the criteria. He has the same blood type, the same shoe size, and owns clothing matching the threads found at the scene of the crime. While this is only circumstantial evidence, what is the probability that a random person would match all of these characteristics if the three characteristics are assumed to be independent of each other? (Give your answer correct to four decimal places.)Explanation / Answer
A : Random person's Blood type match ; P(A) = 15/100 = 0.15
B : Random person's Shoe size match : P(B) = 8/100 = 0.08
C : Random person's Clothing match : P(C) = 35/100 = 0.35
Random person would match all of three charaterstics = A and B and C
Given then that A , B and C are independent
Therefore
Probability that a random person would match all the three characters :
P(A and B and C) = P(A) P(B) P(C) = 0.15 x 0.08 x 0.35 = 0.0042
Probability that a random person would match all the three characters = 0.0042
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