Mathematics - Probability Question with Solution | TestHub

MathematicsProbabilityTotal probability/Bay's TheoremMedium2 minQB
MathematicsMediumsingle choice
Passage / Comprehension

A student buys one of sample papers x, y, z with probabilities 1/7, 1/3, 11/21. Conditional pass probabilities are 1/2, 1/3, 1/6, respectively.

Given the student fails, find the probability that paper was studied.

Options:

Answer:
C
Solution:

By Bayes, P(y|F)=[(1/3)(2/3)]/[(1/7)(1/2)+(1/3)(2/3)+(11/21)(5/6)]=7/23.

Stream:JEESubject:MathematicsTopic:ProbabilitySubtopic:Total probability/Bay's Theorem
2mℹ️ Source: QB

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