In a competitive examination, there were 60 questions. The correct answer would carry 2 marks, and for incorrect answer 1 mark would be deducted. Yashwant had attempted all the questions and he got total 90 maks. Then how many answers did he get wrong?

In an entrance examinations there are multiple choice question. There are five possible answers to each question of which one is correct. The probability that a student knows the answer to a question is 80%. IF he gets the correct answer to the question, then the probability that he was guessing is

A student has appeared for an examination.There are 20 questions in the paper,with four multiple answers.If he answers correctly,he gets 4 marks and if the answer is wrong,then he gets-1 mark.A student will pass in the examination if he gets 50% of the marks.If a student answer by sheer guessing,then what is the probability that he will pass in the examination?

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 find the probability that he was guessing.

A student answers a multiple choice question with 5 alternatives, of which exactly one is correct. The probability that he knows the correct answer is p, 0 lt p lt 1 . If he does not know the correct answer, he randomly ticks one answer. Given that he has answered the question correctly, the probability that he did not tick the answer randomly, is

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