For the experiments in Exercise 4.95, which sample spaces are discrete and which are continuous?

Data from in Exercise 4.95

Describe the sample space for each of the following experiments.
(a) The number of different commercials shown next time you watch your favorite one-hour show.
(b) The time your smartphone will last following an overnight charge.
(c) A sample of 30 students are asked whether or not they visited a social media site in the past h our.