# Question: A biometric security device using fingerprints erroneously refuses to admit

A biometric security device using fingerprints erroneously refuses to admit 1 in 1,000 authorized persons from a facility containing classified information. The device will erroneously admit 1 in 1,000,000 unauthorized persons. Assume that 95 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?

## Relevant Questions

Dolon Web Security Consultants requires all job applicants to submit to a test for illegal drugs. If the applicant has used illegal drugs, the test has a 90 percent chance of a positive result. If the applicant has not used ...For patients aged 81 to 90, the probability is .07 that a coronary bypass patient will die soon after the surgery. (a) What is the expected number of operations until the first fatality? (b) What is the probability of ...De ne a Bernoulli variable for (a) Guessing on a true-false exam question; (b) Checking to see whether an ER patient has health insurance; (c) Dialing a talkative friend's cell phone; (d) Going on a 10-day diet. Calculate each binomial probability: a. X = 2, n = 8, π = .10 b. X = 1, n = 10, π = .40 c. X = 3, n = 12, π = .70 J.D. Power and Associates says that 60 percent of car buyers now use the Internet for re- search and price comparisons. (a) Find the probability that in a sample of 8 car buyers, all 8 will use the Internet; (b) At least ...Post your question