Shaalaa.com | Discrete Random Variables - Example
Each of the total five questions in a multiple choice examination has four choices, only one of which is correct. A student is attempting to guess the answer. The random variable x is the number of questions answered correctly. What is the probability that the student will give atleast one correct answer?
The probability that a person who undergoes kidney operation will recover is 0.5. Find the probability that of the six patients who undergo similar operations,
(a) None will recover
(b) Half of them will recover.
The probability of defective bolts in a workshop is 40%. Find the mean and variance of defective bolts out of 10 bolts.
Given the following table which relates to the number of animals of a certain species at age x . Complete the life table with dx, qx, Lx and Tx.
The probability distribution of a discrete random variable X is: