To find the median low temperature, we first need to arrange the temperatures in ascending order.
The temperatures are: 2°, −3°, −9°, −11°, 1°, −8°, −9°.
Arranging them in ascending order: -11°, −9°, −9°, −8°, −3°, 1°, 2°.
Now, to find the median:
- The number of temperatures is 7 (which is odd).
- The median is the middle number in an ordered list.
In this case, the middle number is the 4th value in the ordered list.
The ordered list is:
- -11°
- -9°
- -9°
- -8° (this is the median)
- -3°
- 1°
- 2°
Therefore, the median low temperature that week is −8°.