Question

The average (mean) temperature for five days was 2°C. If the temperatures for the first four days were -10°C, 30°C, 0°C, and -5°C, what was the temperature on the fifth day?

a) 5°C
b) 1°C
c) -5°C
d) 0°C

Answer 1

The temperature on the fifth day was -5°C.

Step-by-step explanation:

The average (mean) temperature for five days was 2°C. If the temperatures for the first four days were -10°C, 30°C, 0°C, and -5°C, we can find the temperature on the fifth day by multiplying the average temperature by the number of days and subtracting the sum of the temperatures for the first four days.

First, we calculate the sum of the temperatures for the first four days: -10 + 30 + 0 + (-5) = 15°C.

Next, we multiply the average temperature by the number of days: 2 x 5 = 10°C.

Finally, we find the temperature on the fifth day by subtracting the sum of the temperatures for the first four days from the average temperature: 10 - 15 = -5°C.

Therefore, the temperature on the fifth day was -5°C, so the answer is c) -5°C.