Ms. Lanigan rolls a fair die 300

times. How many times does she roll an even

number, theoretically and experimentally?

Theoretically, it would be 150 times that it rolls even. For half of the dice's sides being even and an equal chance of it landing on any of them.

Experimentally, it could be anything between 0-300, although after so many trails in it, it would be extremely likely that it would be near 150.

If it was only 10 trials of instance it would likely have a greater margin of difference compared to the theoretical probability.