The registered temperatures for the six days are:
-6°C, 3°C, 0°C, -1°C, 4°C and -9°C
To find the mean of the low temperatures given, we need to add all of the temperatures and divide the result by the number of days, in this case, 6 days.
The expression to find the mean is as follows:
[tex]\text{Mean}=\frac{(-6)+3+0+(-1)+4+(-9)}{6}[/tex]First, we simplify the numerator of the expression:
[tex]\text{Mean}=\frac{-6+3+0-1+4-9}{6}[/tex]And solving the additions and subtractions we get:
[tex]\text{Mean}=\frac{-9}{6}[/tex]Finally, solving the division:
[tex]\text{Mean}=-1.5[/tex]The mean is -1.5°C.
Answer: -1.5°C