Antibodies against COVID-19 have 90% chance of preventing reinfection. Probability of getting infected and sick without antibodies is 50%. It is estimated that in a country 25% of all people have COVID-19 antibodies.
a) If a person is selected at random, find the probability that (s)he is at the danger of contracting the disease.
b) Draw Venn’s diagram and decision tree for the situation. Explain.
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