What is the value of x, if the probability of guessing the correct answer to a certain test question is x/12 and the probability of not guessing the correct answer to this question is 2/3 ?
The probability of guessing the correct answer to a certain test questions is (x)/(12) If the probability of not guessing the correct answer to this question is (2)/(3) then x=(a)2(b)3(c)4 (d) 6
In answering a question on a multiple choice test for class XII, a student either knows the answer or guesses. Let 3/5 be the probability that he knows the answer and 2/5 be the probability that he guesses. Assume that a student who guesses at the answer will be correct with probability 1/3. Let E_1, E_2 , E be the events that the student knows the answer, guesses the answer and answers correctly respectively. Based on the above information, answer the following sum_(k=1)^(k=2)P(E|E_(k))P(E_(k)) Equals
A student is given a quiz with 10 true or false question, and he answers by sheer guessing. If X is the number of question answered correctly. If the student passes the quiz by getting 7 or maximum correct answer, then the probability that the student passes the quiz is
A test consists of ‘True’ or ‘False’ questions. One mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer. A student knew answers to some of the questions. Rest of the questions he attempted by guessing. He answered 120 questions and got 90 marks. If answer to all questions he attempted by guessing were wrong, then how many questions did he answer correctly?
