Each of five questions on a multiple choice examination has four choices, only one of which is correct. A student is attempting to guess the answer. If the random variable X is the number of questions answered correctly, the probability that the student will get exctly three answer correct is

Each of five questions on a multiple chice examination has four choices,only one of which is correct.A student is attempting to guess the answers.The random variable X is the number of questions answered correctly.(i)What is the probability that the student will get exactly three answers correct?

Each of five questions on a multiple chice examination has four choices,only one of which is correct.A student is attempting to guess the answers.The random variable X is the number of questions answered correctly.(iii)What is the probability that the student will get atleasdt one correct answer?

Each of the total fice questions in amultiple choice examination has four choices, only one of which is correct.A student is attempting to guess the amswer . The renadom varible X is the number of question answerred correctly. What is the probability that the student will giveat least one correct answer ?

There is an objective type question with 4 answer choices exactly one of which is correct. A student has not studied the topic on which the question has been set. The probability that the student guesses the correct answer, is

A multiple choice examination has ten questions, each question has four distractors with exactly one correct answer. Suppose a student answers by guessing and it X denotes the number of correct answers, find (i) binomial distribution (ii) probability that the student will get seven correct answers (iii) the probability of getting at least one correct answer.

The probability that a student knows the correct answer to a multiple choice question is 2/3 . If the student does not know the answer, then the student guesses the answer. The probability of the guessed answer being correct is 1/4 . Given that the student has answered the question correctly the probability that the student knows the correct answer is