In an entrance test there are multiple choice questions. There are four possible answers…
Mathematics · JEE Main · NTA Exams — Statistics and Probability
In an entrance test there are multiple choice questions. There are four possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 90%. If he gets the correct answer to a question, then the probability that he was guessing, is
- \(\frac{37}{40}\)
- \(\frac{1}{37}\)
- \(\frac{36}{37}\)
- \(\frac{1}{9}\)
Answer
(B) 1 37
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