Kari plans to sample 20 people of a population that contains 100 students. She wants to determine how many people wake up before 6 a.m. Which sample is the most random?

Taking 5 students from each of the 4 homeroom classes includes students from across the population, rather than selecting a group based on a trait that may relate to waking early. The other choices could be biased: breakfast-line and early-arriving students may be more likely to wake early, and swim-team members are a specific group. So the most random sample is 5 students from each homeroom class.

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