When we use prediction, we can only say levels.
For example: We have 500 sample data for our walking range. And let's say 90 percentile is 16.0 km and 10th percentile is 0.78 km. Well, can only say that there's a 80% probability that we will walk between 0.78 km - 16 km. Or 90% we will walk less than 26 km and 90% we will walk more than 0.78 km. But is there a way to say 75% we will walk that much instead of giving a range?
Or is percentile the only well-known way to use for such predictions? I know we can use regressions, providing more information but the only information we have is this.
EDIT: We can only say today we have walked 9km which is 75th percentile. But how can we say that there's a 75% probability to walk 9km tomorrow? Or simply can't we?
EDIT 2: To be more clear. Is there a way to say: Tomorrow 75% you will walk 8km instead of 75% you will walk less than 8km?