Question

The mean temperature for the first 7 days in January was 4 °C. The temperature on the 8th day was -1 °C. What is the mean temperature for the first 8 days in January?

Answer 1

3.375 °C

Explanation:

Mean temperature for first 7 days = 4 °C

⇒ Total temperature over first 7 days = 4 °C × 7 = 28 °C

Temperature on 8th day = -1 °C

`\sf mean=\frac{\textsf{sum of all the numbers}}{\textsf{amount of numbers}}`

Therefore, mean temperature for first 8 days:

= [28 - 1] ÷ 8

= 27 ÷ 8

= 3.375 °C