贝叶斯公式

Only 1 in 1000 adult is afflicted with a rare disease for which a diagnostic test has been developed. The test is such that, when an individual actually has the disease, a positive result will diagnostic 99% of the time, while an individual without the disease will show a positive test result only 2% of the time. What is the probability of a individual has positive result? What is the probability an individual with positive result has the disease?

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