A box contains 9 yellow counters, 4 blue counters, and 7 orange counters. If one counter is chosen without looking, what is the probability that it is yellow?
- 9 yellow counters
- 4 blue counters
- 7 orange counters
Choose the best answer.
Note
For basic probability, compare the number of favorable outcomes with the total number of equally likely outcomes.
- Count the favorable outcomes first: there are 9 yellow counters.
- Then count all possible outcomes: 9 + 4 + 7 = 20.
- Probability means favorable outcomes divided by total outcomes, so the probability is 9/20, which simplifies to 9/20.
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.