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Kaushik786
Joined: 20 May 2018
Last visit: 13 Dec 2023
Posts: 71
Own Kudos:
Given Kudos: 71
Location: India
Schools: Booth '22 Anderson '22 CBS '22 Johnson '22
GMAT 1: 740 Q50 V41
24 Mar 2020, 23:53
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Doctors have devised a test for koronavirus that has the following property: For any person suffering from korona, there is a 90% chance of the test returning positive. For a person not suffering from korona, there is an 80% chance of the test returning negative. It is known that 10% of people who go for testing have korona. If a person who gets tested gets a +ve result for korona (as in, the test result says they have got korona), what is the probability that they actually have korona?
a. 7/10
b. 8/11
c. 1/3
d. 1/2
e. 1/4
a. 7/10
b. 8/11
c. 1/3
d. 1/2
e. 1/4
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24 Mar 2020, 23:56
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Kaushik786
Discussed here: doctors-have-devised-a-test-for-leptospirosis-that-has-298953.html?fl=similar
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