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Question
The probability that a student will pass the final examination in both English and Tamil is 0.5 and the probability of passing neither is 0.1. If the probability of passing the English examination is 0.75, what is the probability of passing the Tamil examination?
Solution
Let A be the event of getting student pass in English
Let B be the event of getting student pass in Tamil
P(A ∩ B) = 0.5 = `1/2`
P(A) = 0.75 = `75/100 = 3/4`
P(A ∪ B) = 0.1
P(A ∪ B) = `1/10`
1 − P(A ∪ B) = `1/10`
P(A ∪ B) = `1 - 1/10`
P(A ∪ B) = `9/10`
P(A) + P(B) − P(A ∩ B) = `9/10`
= `3/4 + "P"("B") - 1/2 = 9/10`
P(B) = `9/10 + 1/2 - 3/4`
= `(18 + 10 - 15)/20`
= `13/20`
Probability of passing the tamil examination is `13/20`
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