Which of the following is not a random variable?

The time it takes to travel from California to Illinois.

The age of the driver in cars passing through a toll booth.

The type of animal that a resident of Florida owns.

The number of heads in ten tosses of a fair coin.

x	1	2	3	4	5	6
P(x)	0.3	0.2	0.2	0.2	0	0.1

No, this is not a valid discrete probability distribution because three probabilities match. You cannot have the same probability for more than one outcome.

No, this is not a valid discrete probability distribution because a probability is equivalent to 0 which is not possible.

Yes, this is a valid discrete probability distribution because all of the probabilities add to 1, and all probabilities are between 0 and 1.

No, this is not a valid discrete probability distribution because this is considered a continuous probability distribution.

Which of the following random variables is continuous?

Documenting the shoe sizes of all players in the NBA.

Tallying the number of times a coworker has been late to work.

Measuring the distance travelled by different cars using 1-liter of gasoline.

Recording the number of medals that the American Olympic team won in each of the past 20 Olympic games.

Which of the following random variables is discrete?

Reporting the time it takes for an LED bulb to burn out.

Documenting the amount of weight loss per week for a new diet.

Recording the number of times a player must spin a roulette wheel before they get the number

Measuring the heights of all players in the NBA.