The 10% of the people of a city are infected by some virus. A rapid test asserts if the examined person is positive in the virus. The probability that the test ends to be “Positive” (i.e. the test asserts that the person examined is infected) equals with: 0.9 when the examined person is infected and 0.05 when the examined person is not infected. We pick randomly a person and apply to him the rapid test. (a) Find the probability the person to be found as “Positive” in the rapid test.

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