Final answer:
To find the average temperature from the given set of readings, one would add all the temperatures together and then divide by the number of readings, resulting in an average temperature of -6 degrees.
Step-by-step explanation:
The question involves calculating the average temperature from a given set of temperature readings recorded every 4 hours. To find the average temperature, you sum all the temperatures and then divide by the number of temperature readings:
\((-16) + (-10) + 2 + 6 + (-5) + (-13) = -36\)
There are six temperature readings, so you divide the sum by six:
\(-36 \div 6 = -6\)
Therefore, the average temperature recorded on this very cold day was \(-6\degree\).