To express the probability \( P(\text{green}) = 0.5 \) as a percent, you can multiply it by 100:
\[ P(\text{green}) = 0.5 \times 100 = 50% \]
To express the probability as a fraction, you can write it as:
\[ P(\text{green}) = \frac{1}{2} \]
A word or phrase to describe this probability could be "likely" or "even chance," indicating that there is a 50% chance of selecting a green elastic band.
So, the final responses are:
- \( P(\text{green}) = 50% \)
- \( P(\text{green}) = \frac{1}{2} \)