To find the average temperature for the week of December 3rd, you first need to add the temperatures together and then divide by the number of days.
The temperatures for the week are:
- Monday: -9°F
- Wednesday: -7°F
- Thursday: -5°F
- Friday: 6°F
Now, let's add them up:
\[ -9 + (-7) + (-5) + 6 = -9 - 7 - 5 + 6 \]
Calculating step by step:
- \(-9 - 7 = -16\)
- \(-16 - 5 = -21\)
- \(-21 + 6 = -15\)
Now, we have the total temperature as \(-15°F\).
Next, divide this total by the number of days (4):
\[ \text{Average temperature} = \frac{-15}{4} = -3.75°F \]
Thus, the average temperature for the week of December 3rd is \(-3.75°F\).