In a balanced die, each side (numbered 1 through 6) has an equal probability of landing face up. When rolling a fair die multiple times, we expect the outcomes to be evenly distributed among the six sides over a large number of rolls.
Given that Jimmy is planning to roll the die 400 times, he should expect the results to be approximately uniform. Therefore, he should roll each number (1, 2, 3, 4, 5, and 6) roughly the same number of times.
So, the correct answer is:
C. Jimmy should roll approximately the same amount of all numbers on the die.