Answer
Option B is correct.
Step-by-step explanation
The reasonable description of the typical length of a worm is the mean of the worm lengths for each container.
And since the mean is obtained by summing up all the lengths and dividing by the number of worms, we can tell that container A has more worms with lengths longer than 15 millimeters while container B has just the optimal amount of worms with lenght around the 15 millimeters mark and the rest to balance out.
So, container B is more likely to contain worms with a mean length of 15 millimeters.
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