Answer:
Explanation:
In order to find the mean temperature for the first 8 days of January, we have to calculate the weighted average.
We have the following data:
- The mean temperature for the first 7 days was 6 °C. this means that we have
with a weight of
(7 days)
- The temperature on the 8th day was -3 °C, this means that we have
with a weight of
(1 day only)
So we can calculate the mean temperature using the weighted average, so we have: