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Mathematics, 27.07.2021 16:20 byejpg

A biometric security device using fingerprints erroneously refuses to admit 1 in 2,000 authorized persons from a facility containing classified information. The device will erroneously admit 1 in 1,009,000 unauthorized persons. Assume that 90 percent of those who seek access are authorized. If the alarm goes off and a person is refused admission, what is the probability that the person was really authorized?

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