Question

c. is the eye color of people on commercial aircraft flights a discrete random variable, a continuous random variable, or not a random variable?
a. it is a discrete random variable.
b. it is a continuous random variable.
c. it is not a random variable.
d. is the time it takes for a light bulb to burn out a discrete random variable, a continuous random variable, or not a random variable?
a. it is a discrete random variable.
b. it is a continuous random variable.
c. it is not a random variable.
e. is the number of textbook authors now sitting at a computer a discrete random variable, a continuous random variable, or not a random variable?
a. it is a discrete random variable.
b. it is a continuous random variable.
c. it is not a random variable.

Explanation:

• c: Eye color is a categorical variable (not numerical), so it is not a random variable.
• d: Time is a continuous random variable as it can take any value within an interval (e.g., \(t = 10.5\) hours, \(t= 10.55\) hours etc.).
• e: Number of textbook authors is a discrete random variable as it can take only whole - number values (e.g., 1, 2, 3...).

Answer:

c. C. It is not a random variable.
d. B. It is a continuous random variable.
e. A. It is a discrete random variable.