To calculate the mean (average) of the given numbers, follow these steps:

1. **Add the numbers together:**
   \[
11.4 + 12.3 + 10.8 = 34.5
\]

2. **Divide by the total number of values (3 in this case):**
   \[
\text{Mean} = \frac{34.5}{3} = 11.5
\]

So, the mean of the numbers 11.4, 12.3, and 10.8 is **11.5**.

Would you like more details or have any questions?

Here are 5 related questions you might find useful:
1. How do you calculate the median of a set of numbers?
2. What is the mode, and how is it different from the mean?
3. How do you find the range of a data set?
4. How does adding an outlier affect the mean?
5. Can you calculate the weighted mean, and how does it differ from the regular mean?

**Tip:** When calculating the mean, always double-check the number of values to avoid mistakes.

Learn how to calculate the mean of the numbers 11.4, 12.3, and 10.8. Follow a step-by-step solution to find the average, using the formula (Sum of values) / (Number of values). Suitable for students in Grades 5-7.

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