1. **State the problem:** We need to find the average (mean) of the given numbers: 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. 2. **Formula for average:** The average of $n$ numbers $x_1, x_2, ..., x_n$ is given by $$\text{Average} = \frac{x_1 + x_2 + \cdots + x_n}{n}$$ 3. **Count the numbers:** There are 24 numbers in total. 4. **Sum the numbers:** $$2.90 + 3.18 + 3.10 + 3.18 + 3.18 + 3.00 + 3.67 + 3.70 + 2.90 + 3.70 + 3.40 + 3.40 + 3.40 + 3.67 + 3.08 + 3.44 + 3.43 + 3.18 + 3.04 + 3.67 + 3.70 + 3.70 + 3.70 + 3.40 = 80.82$$ 5. **Calculate the average:** $$\text{Average} = \frac{80.82}{24}$$ 6. **Simplify the fraction:** $$\text{Average} = \cancel{\frac{80.82}{24}} = 3.3675$$ 7. **Final answer:** The average of the given numbers is approximately **3.37**.