The mean temperature for the first 8 days in January can therefore be concluded to be; 3°C.
What is the mean temperature for the first 8 days in January?
It follows from the task content that the mean temperature for the first 7 days in January was 3 °C, it can therefore be inferred that the sum total of all temperatures in 7 days was 21°C.
Hence, upon the 8th day, the mean temperature is; (21+3)/8 = 3°C.
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