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
.