Answer:
The mean temperature for the first 8 days in January is 5.375 °C
Explanation:
The means = The sum ÷ The number
∵ The mean temperature for the first 7 days in January was 5 °C
∴ The mean = 5
∴ The number = 7
→ Substitute them in the rule above
∵ 5 = The sum ÷ 7
→ Multiply both sides by 7
∴ 35 = The sum
∴ The sum of the temperature for the first 7 days is 35 °C
∵ The temperature on the 8th day was 8 °C
→ Add it to the sum of the first 7 days to find the sum of the first 8 days
∴ The sum of the first 8 days = 35 + 8
∴ The sum of the first 8 days = 43 °C
∵ The number of days = 8
→ Substitute them in the rule above to find the mean
∴ The mean = 43 ÷ 8
∴ The mean = 5.375 °C
∴ The mean temperature for the first 8 days in January is 5.375 °C