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To find the median, we need to find the middle value in the set of temperatures.
First, we need to order the temperatures from least to greatest:
-11°, -9°, -9°, -8°, -3°, 1°, 2°
There are 7 temperatures in total, so the middle value is the 4th temperature, which is -8°.
Therefore, the median low temperature for that week was -8°.