Definition
Simple event
An event that contains exactly one outcome from the sample space.
Continue from this idea into connected AXIO math.
One event, one outcome.
Boundary: On that spinner, “land on an even number” is not simple because it contains two outcomes: 2 and 4.
What it means
A simple event names one exact result, not a group of results. It is the smallest event you can point to in the sample space.
Remember it
One event, one outcome.
Example
A spinner has equal sections numbered 1, 2, 3, and 4. The event “land on 3” is the one-outcome set {3}, so it is a simple event.
Watch for
On that spinner, “land on an even number” is not simple because it contains two outcomes: 2 and 4.
Common mix-up
Simple describes the number of outcomes in the event, not whether the experiment feels easy.
Exact meaning
A simple event is an event containing exactly one outcome in the sample space of a random experiment.