To simulate the random assignment of Benjamin to one of the four homerooms, the following methods can be used:
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Draw a marble from a bag containing 5 white marbles, 5 black marbles, 5 red marbles, and 5 green marbles, with each color representing a different homeroom. (This method provides an equal chance of being assigned to each homeroom.)
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Roll a number cube with 1 representing the first homeroom, 2 representing the second homeroom, 3 representing the third homeroom, and any other outcome representing the fourth homeroom. (This allows for 3 outcomes that guarantee a homeroom assignment plus 3 additional possibilities representing the fourth homeroom.)
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Spin a spinner with 8 congruent sections with 2 sections assigned to each homeroom. (This method ensures equal representation for each homeroom, as each has the same probability of being spun.)
The other options (flip a coin 4 times and the random number generator) do not correctly represent an unbiased assignment to four homerooms.