Find the mean of the following set of numbers:
6,9,11,12 and 7

Answer

To find the mean of the set of numbers 6, 9, 11, 12, and 7, follow these steps:

### Step 1: Add all the numbers together.
We will sum the numbers in the set:
\[ 6 + 9 + 11 + 12 + 7 \]

### Step 2: Calculate the sum.
Now, let's perform the addition:
\[ 6 + 9 = 15 \]
\[ 15 + 11 = 26 \]
\[ 26 + 12 = 38 \]
\[ 38 + 7 = 45 \]
So, the total sum of the numbers is 45.

### Step 3: Count the total number of values.
Next, we need to count how many numbers are in the set. The numbers are: 6, 9, 11, 12, and 7.
There are 5 numbers in total.

### Step 4: Divide the sum by the total number of values.
Now, we will divide the sum by the total number of values to find the mean:
\[ \text{Mean} = \frac{\text{Sum of numbers}}{\text{Total number of values}} = \frac{45}{5} \]

### Step 5: Calculate the mean.
Now, let's perform the division:
\[ \frac{45}{5} = 9 \]

### Conclusion:
The mean of the set of numbers 6, 9, 11, 12, and 7 is 9.

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