Home
Class 12
MATHS
In an entrance examination there are mul...

In an entrance examination there are multiple dioice questions. Ihere are fous pessibie snswers to each question uf which one is correct. The probabinity that a student knows the answer to a question is 90 %. If he gets the correct answer to the question, then the probability that he was guessing is

A

11/37

B

36/37

C

1/37

D

37/40

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • PERMUTATION AND COMBINATIONS

    HIMALAYA PUBLICATION|Exercise Question Bank|104 Videos

  • PROGRESSIONS

    HIMALAYA PUBLICATION|Exercise QUESTION BANK|97 Videos

Similar Questions

Explore conceptually related problems

On a multiple choice questions with three possible answers for each of the five questions, what is the probability that a candidate would get 4 or more correct answers just by guessing ?

In an examination there are three multiple choice questions and each questions has 4 choices . Number of ways in which a students can find to get all answers correct is :

In an examination there are three multiple choice questions and each questions has 4 choices . Number of ways in which a students can fail to get all answers correct is :

The probability of guessing the correct answer in a certain test is P/(12) . If probability of one guessing the correct answer to this question is 1/3 , find value of P.

In a test, an examinee either guesses or copies or knows the answer to a multiple choice question with four choices. The probability that he makes a guess is 1/3 and the probability that he copies the answer is 1/6. The probability that his answer is correct given that he copied it is 1/8. Find the probability that he knew the answer to the question, given that he correctly answered it.

In a multiple choice question, there are five alternative answers of which one or more than one are correct. A candidate will get marks on the question, if he ticks all the correct answers. If he decides to tick answer all random, then the least number of choices should he be allowed, so that the probability of his getting marks on the question exceeds (1)/(8) is

In answering a question on a multiple choice test a student either knows the answer or guesses. Let 3/4 be the probability that he knows the answer and 1/4 be the probability that he guesses. Assuming that a student who guesses the answer will be correct with probability 1/4. What is the probability that a student knows the answer given that he answered it correctly.

In answering a question on a multiple choice test a student either knows the answer or gueses . Let 3 /4 be the probability that he knows the answer and 1/4 be the probability that he guesses . Assuming that a student who guesses at the answer will be correct with probability 1/4 what is the probability that a student knows the answer given that he answered it correctly ?

In an examination, 20 questions of true-false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the coin falls heads, he answers 'true', if it falls tails, he answers 'false'. Find the probability that he answers at least 12 questions correctly.

In an examination 20question of true-false are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the coin falls heads, the answer 'true', if it falls tails, he answers. 'false' find the probabilities that he answers at least 12 questions correctly

HIMALAYA PUBLICATION-PROBABILITY-QUESTION BANK
  1. If A and B are independent events such that P(A) gt 0, P(B) gt 0, then

    Text Solution

    |

  2. If random variable X has the following probability distribution then t...

    Text Solution

    |

  3. In an entrance examination there are multiple dioice questions. Ihere ...

    Text Solution

    |

  4. The numbers are chosen from 1 to 30 . The probability that they are no...

    Text Solution

    |

  5. Choose the correct answer: In a box containing 100 bulbs, 10 are def...

    Text Solution

    |

  6. In a binomial distribution n =4, P(X = 0) = 16/81 then P(X=4) equals

    Text Solution

    |

  7. A rifleman is firing at a distant target and has only 10 % chance of h...

    Text Solution

    |

  8. If A and B are arbitrary events then

    Text Solution

    |

  9. A coin is tossed 2 n times. The chance that the number of times one ge...

    Text Solution

    |

  10. Three identical dice are rolled. The probability that the same number ...

    Text Solution

    |

  11. A die is tossed thrice. If event of getting an even number is a succes...

    Text Solution

    |

  12. If x = 33^(n), where n is a positive integral value, then what is the ...

    Text Solution

    |

  13. X speaks truth in 60% and 'Y' in 50% of the cases. The probability tha...

    Text Solution

    |

  14. For a party 7 guests are invited by a husband and wife. They sit in a ...

    Text Solution

    |

  15. There are 12 white and 12 red balls in a bag. Balls are drawn one by o...

    Text Solution

    |

  16. A die is thrown 100 times, getting an even number is considered a succ...

    Text Solution

    |

  17. If A and B are mutually exclusive events with P(B) ne 1 then P(A|bar B...

    Text Solution

    |

  18. 5 persons A, B, C, D and E are in a queue of a shop. The probability t...

    Text Solution

    |

  19. Two cards are drawn successively with replacement from a well suffled ...

    Text Solution

    |

  20. If X and Y are independent binomial variates, B(5,1/2) and B(7,1/2), t...

    Text Solution

    |