Some predictions can be based on what is known about the past, assuming that conditions are pretty much the same now.
Learning Goal 2
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.
For Grades: 6-8
Learning Goal 1
How probability is estimated depends on what is known about the situation. Estimates can be based on data from similar conditions in the past or on the assumption that all the possibilities are known.