Heart failures are due to either natural occurrences (89%) or outside factors (11%). Outside factors are related to induced substances (73%) or foreign objects (27%). Natural occurrences are caused by arterial blockage (56%), disease (27%), and infection (e. g., staph infection) (17%). Round your answers to four decimal places (e. g. 98.7654). a) Determine the probability that a failure is due to induced substance. Choose the answer in accordance to the item a) of the question statement. b) Determine the probability that a failure is due to disease or infection. Choose the answer in accordance to the item b) of the question statement.