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 ?

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 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 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

On a multiple choice examination with 4 possible answers for each of 6 questions the probability that a student would get at least two correct answers just by guessing is -

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

These 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 probility that the student guesses the correct answer is

These 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 probility that the student guesses the correct answer is

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