Question

The mean temperature for the first 7 days in January was 4 °C.

The temperature on the 8th day was 4 °C.
What is the mean temperature for the first 8 days in January?

Answer 1

4° C

Explanation:

The average temperature for 7 days is

(sum of first 7 temperatures)

------------------------------------------ = 4° C

7 days

Thus, the mean temperature for the first 8 days is

(7 days)(4° C) + 4° C 32° C

----------------------------- = ---------- = 4° C

8 days 8