1. **State the problem:** We need to find the average (mean) of the given numbers. 2. **Formula for average:** The average of $n$ numbers $x_1, x_2, \ldots, x_n$ is given by $$\text{Average} = \frac{x_1 + x_2 + \cdots + x_n}{n}$$ 3. **Count the numbers:** There are 25 numbers in the list. 4. **Sum the numbers:** $$2.90 + 2.90 + 3.18 + 3.10 + 3.18 + 3.18 + 3.00 + 3.67 + 3.70 + 2.90 + 3.70 + 3.40 + 3.40 + 3.40 + 3.67 + 3.08 + 3.44 + 3.43 + 3.18 + 3.04 + 3.67 + 3.70 + 3.70 + 3.70 + 3.40 = 83.82$$ 5. **Calculate the average:** $$\text{Average} = \frac{83.82}{25}$$ 6. **Simplify:** $$\text{Average} = 3.3528$$ 7. **Final answer:** The average of the given numbers is approximately **3.35**.