A student investigates the rate of photosynthesis by measuring the volume of oxygen gas produced by an aquatic plant. The table shows their results:
| Trial 1 | Trial 2 | Trial 3 | Trial 4 |
|---|---|---|---|
| 34 cm3 | 31 cm3 | 35 cm3 | 32 cm3 |
What is the mean volume of oxygen gas produced?
32 cm332\text{ cm}^332 cm3
33 cm333\text{ cm}^333 cm3
34 cm334\text{ cm}^334 cm3
35 cm335\text{ cm}^335 cm3