Question

The mean temperature for the first 4 days in January was 8°C.

The mean temperature for the first 5 days in January was 6°C.
What was the temperature on the 5th day?

Answer 1

-2°C

Explanation:

Sum of 4 days: 4 × 8 = 32

Sum of 5 days: 5 × 6 = 30

5th day: 30 - 32 = -2