The probability of success remains the same from trial to trial. 

These are random variables that can assume all values between any two specific values.

The area under the part of a normal curve that lies within one standard deviation of the mean is ________.

The normal distribution is unimodal.

These are random variables that can take on any of the countless number of values in an interval.

When you roll the two dice, what is the probability that the sum is 9?

Random means that the experiment may result in one of several possible values of the variable.

It is a numerical measure of the likelihood that a specific event will occur.

The area under the part of a normal curve that lies within three standard deviation of the mean is ________.

It is a mapping or list of all values of a random variable to their corresponding probabilities for a given sample space.