Random Variables and Probability Distributions
- The probability distribution of a discrete random variable is a listing of each possible value taken by along with the probability that takes that value in one trial of the experiment.
- The mean of a discrete random variable is a number that indicates the average value of over numerous trials of the experiment. It is computed using the formula .
- The variance and standard deviation of a discrete random variable are numbers that indicate the variability of over numerous trials of the experiment. They may be computed using the formula , taking the square root to obtain .