Question

The mean temperature for the first 7 days in January was 3 °C.

The temperature on the 8th day was 3 °C.
What is the mean temperature for the first 8 days in January?

Answer 1

Answer: Most likely the mean would still be 3°C. I could give you the definite answer if I knew what the other data points were, and how they were arranged on a dotplot/histogram for easyness to find the mean, median, and mode.