Statistical predictions (as for rainy days, accidents) are typically better for how many of a group will experience something than for which members of the group will experience it—better for how often something will happen than for exactly when.
Learning Goal 3a
Summary predictions are usually more accurate for large collections of events than for just a few.
Learning Goal 4a
Spreading data out on a number line helps to see what the extremes are, where they pile up, and where the gaps are.