Option B:
The mean low temperature of last week is 6.
Solution:
The daily low temperatures are:
-2°F, -3°F, -1°F, 8°F, 10°F, 12°F and 18°F.
Sum of the daily temperatures = -2 - 3 - 1 + 8 + 10 + 12 + 18
= 42
Number of days of the week = 7
[tex]$\text{Average}=\frac{\text{Sum of the temperatures}}{\text{Number of days}}[/tex]
[tex]$=\frac{42}{7}[/tex]
Average = 6
The mean low temperature of last week is 6.
Option B is the correct answer.
