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Antibodies against COVID-19 have 90% chance of preventing reinfection. Probability of getting infected and sick without...

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.

Math   Statistics-And-Probability   
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