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216 points 2. Heart failures are due to either natural occurrences (73%) or outside factors (27%). Outside factors are related to induced substances (73%) or foreign objects (27%). Natural occurrences are caused by arterial blockage (56%), disease (27%), and infection (17%). [15 points] a. Construct a probability tree diagram. b. Determine the probability that a failure is due to an induced substance. b. Determine the probability that a failure is due to disease or infection