Find the sum of 12 numbers whose mean is 11.

Answer

To find the sum of 12 numbers whose mean is 11, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the formula for mean**: The mean (average) of a set of numbers is calculated using the formula:
\[ \text{Mean} = \frac{\text{Sum of all observations}}{\text{Number of observations}} \]

2. **Identify the given values**: From the question, we know:
- Mean = 11
- Number of observations (n) = 12

3. **Rearrange the formula to find the sum**: We can rearrange the formula to find the sum:
\[ \text{Sum} = \text{Mean} \times \text{Number of observations} \]

4. **Substitute the known values into the formula**:
\[ \text{Sum} = 11 \times 12 \]

5. **Perform the multiplication**:
\[ 11 \times 12 = 132 \]

6. **Conclusion**: The sum of the 12 numbers is 132.

### Final Answer:
The sum of the 12 numbers is **132**.