There are 4 yellow tiles and 4 green tiles in a bag. One tile is selected at random. What is the probability of NOT selecting a yellow tile?
- 4 yellow tiles
- 4 green tiles
Choose the best answer.
Note
For a “not” event, count the outcomes outside the named event. This is the complement of the event.
- The complement of selecting yellow is selecting any other color.
- There are 4 non-yellow tiles out of 8 total tiles.
- So the probability is 4/8 = 1/2.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 1/2. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.