A box contains 4 yellow counters, 7 white counters, and 2 green counters. If one counter is chosen without looking, what is the probability that it is yellow?
- 4 yellow counters
- 7 white counters
- 2 green 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 4 yellow counters.
- Then count all possible outcomes: 4 + 7 + 2 = 13.
- Probability means favorable outcomes divided by total outcomes, so the probability is 4/13, which simplifies to 4/13.
The correct answer is 4/13. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.