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Which of the following situations does not describe a discrete random variable?

The number of eggs in a carton of $12\text{ eggs}$ which are found to be cracked or broken.

The number of times a coin will land on heads when tossed $10\text{ times}$.

The number of times in one month that a service technician must be called in to repair the office Xerox machine.

The number of days in one week where Javier will have a substitute teacher in at least one of his classes.

The amount of time it takes an experienced runner to run one mile.