Probability of having COVID = 0.1% = 0.001. Probability of not having COVID = 1−0.001=0.999.
It is given that only 0.1% of a large population have COVID infection. In this population, the reliability of COVID RTPCR-test is specified as…
CUET UG 2022 — Mathematics Algebra
2022mcqeasy
It is given that only 0.1% of a large population have COVID infection. In this population, the reliability of COVID RTPCR-test is specified as follows :
For persons having COVID, 90% of the test detects the disease but 10% goes undetected. For persons not having COVID, 99% of the test is judged COVID negative but 1% are diagnosed as COVID positive.
Based on the above informations, answer the question :
The probability that randomly selected person from a population, not having COVID is :
Official previous-year question
Held on 17 Aug 2022 · Verified 13 Jul 2026.
Options
- A
0.998
- B
0.999
- C
0.001
- D
0.990
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