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  • Provide solution for RD Sharma Maths Class 12 Chapter 30 Probability Exercise Case Study Based  Question, question 3 sub question (ii).

Provide solution for RD Sharma Maths Class 12 Chapter 30 Probability Exercise Case Study Based  Question, question 3 sub question (ii).

Answers (1)

Answer:

            (c)

Hint:

            You must know rules of finding probability

Given:

            90% test detect the disease, 10% go undetected, 99% judged HIV –ve and 1% judged

HIV +ve, 0.1% have HIV

Solution:

E= Person selected has HIV

F= Person selected does not have HIV

G= Test judges HIV +ve

Probability that person tested HIV +ve give that he/she actually is not HIV infected,

\begin{aligned} &P\left(\frac{G}{F}\right)=1 \% \\ &=\frac{1}{100}=0.01 \end{aligned}

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