A USA Today article titled “Electronic world swallows up kids’ time, study finds” (March 10, 2005) presented the following chart depicting the average amount of time 8- to 18-year-olds spend daily on various activities. The Kaiser Family Foundation had conducted the study of 2000 children in grades 3 through 12.

Activity Average Amount of Time Watching TV 3 hours, 51 minutes Listening to music 1 hour, 44 minutes Using a computer 1 hour, 2 minutes Playing video games 49 minutes Reading 43 minutes Watching movies 25 minutes

a. What is the random variable involved in this study?

b. Is the random variable discrete or continuous?

Explain.