Harry is a dedicated teacher and delivers his tutorials on campus during COVID-19 pandemic. However, he worries that he would be infected and pass on the virus to his family. Therefore. every time he comes back campus, he will take the COVID-19 self-test for 3 times and stay at office for a night if at least one of the test results is positive. it is known that the COVD-19 self-test has a sensitivity and specificity of 0.61 and 0.51. That is, the probability that Harry is tested positive given that he is infected is 0.61, and that he is tested negative given that he is not infected is 051. The test results are independent given Harry's health condition. On average, about I in 5 people in Hong Kong are infected with the virus. Suppose Harry has decided to go home after work today. Find the probability that he is not infected with the virus. Select one

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Harry is a dedicated teacher and delvers his tutorials on campus during COVID-19 pandemic. However, he worries that he would be infected and pass on the virus to his family. Therefore,
every time he comes back campus, he will take the COVID-19 seif-test for 3 times and stay at office for a night if at least one of the test results is positive. It is known that the COVID-19 self-test
has a sensitivity and specificity of 0,61 and 0.51. That is, the probability that Harry is tested positive given that he is infected is 0.61, and that he is tested negative given that he is not infected
is 0.51. The test results are independent given Harry's health condition. On average, about I in 5 people in Hong Kong are infected with the virus.
Suppose Harry has decided to go home after work today. Find the probability that he is not infected with the virus,
Select one
Oa 0.8994
Ob. 0.6647
Oc 0.2000
Od. 0.8000
Oe. 09556
Transcribed Image Text:Harry is a dedicated teacher and delvers his tutorials on campus during COVID-19 pandemic. However, he worries that he would be infected and pass on the virus to his family. Therefore, every time he comes back campus, he will take the COVID-19 seif-test for 3 times and stay at office for a night if at least one of the test results is positive. It is known that the COVID-19 self-test has a sensitivity and specificity of 0,61 and 0.51. That is, the probability that Harry is tested positive given that he is infected is 0.61, and that he is tested negative given that he is not infected is 0.51. The test results are independent given Harry's health condition. On average, about I in 5 people in Hong Kong are infected with the virus. Suppose Harry has decided to go home after work today. Find the probability that he is not infected with the virus, Select one Oa 0.8994 Ob. 0.6647 Oc 0.2000 Od. 0.8000 Oe. 09556
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