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In medical diagnostics for a disease,sensitivity (denoted by a) of a test refers to the probability that a test result is positive for a person with the disease, whereas specificity (denoted by b) refers to the probability that a person without the disease tests negative. A diagnostic test for COVID-19 has the values of a=0.99 and b=0.99.If the prevalence of COVID-19 in a population is estimated to be 20%, the probability that a randomly chosen person person tests positive for COVID-19 is​

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