Question

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

The temperature on the 8th day was 1 °C.

What is the mean temperature for the first 8 days in January?

Answer 1

Answer: Mean temperature for the first 8 days in January is 6.25°C.

Explanation:

Since we have given that

Mean temperature for the first 7 days in January = 7° C

Temperature on 8th day = 1°C

As we know that

Average for first 7 days is given by

`\frac{\text{Sum of temperature for the first 7 days}}{7}\\\\7=\frac{\text{Sum of temperature for the first 7 days}}{7}\\\\\text{Sum of temperature for the first 7 days }=7* 7=49^\circ C`

Now, Average temperature for the first 8 days in January would be

`=(49+1)/(8)\\\\=(50)/(8)\\\\=6.25^\circ C`

Hence, mean temperature for the first 8 days in January is 6.25°C.

Answer 2

Answer:6.25

Explanation:

Mean temperature for first 7 days is

Sum of temperatures for each day ÷ number of days

7 = sum of temperatures for each day/7

Let x =Sum of temperatures for 7 days=x/7

x=49

For 8 days, total sum of temperatures is x +1 = 49+1 = 50

Mean temperature for first 8 days is

Sum of temperatures for each day ÷ number of days

= 50/8= 6.25