A company orders boxed lunches from a deli, which all cost the same price. The relationship between the number of boxed lunches ordered, xx, and the total cost in dollars of the lunches, yy, is represented by the graph below.

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?