To find the average temperature for the week, you first need to sum up all the temperatures and then divide by the number of days.
The temperatures for the week are:
- M: -9°F
- T: 5°F
- W: 7°F
- TH: 5°F
- F: 6°F
Now, let's sum these temperatures:
\[ -9 + 5 + 7 + 5 + 6 = -9 + 23 = 14 \]
Now that we have the total sum of the temperatures (14°F), we need to divide it by the number of days (5):
\[ \text{Average temperature} = \frac{14}{5} = 2.8°F \]
Therefore, the average temperature for the week of December 3rd is 2.8°F.