There are 11 orange stickers and 9 purple stickers in a bag. One sticker is selected at random. What is the probability of NOT selecting a orange sticker?
- 11 orange stickers
- 9 purple stickers
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 orange is selecting any other color.
- There are 9 non-orange stickers out of 20 total stickers.
- So the probability is 9/20 = 9/20.
- A complement probability can also be found by doing 1 minus the probability of the event.
The correct answer is 9/20. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.