Calculate the amplitude of the air temperature if the maximum temperature was +12, and the minimum was -8

Calculate the amplitude of the air temperature if the maximum temperature was +12, and the minimum was -8 and if the maximum temperature was 0, and the minimum was -7. Calculate the average air temperature if the temperatures were +12, 0, -4, +10, +15 ..

The air amplitude is calculated by adding the minimum and maximum readings, if the SIGNS DIFFERENT (+ and -), IF SIGNS ARE THE SAME (+ and +; – and -), then we read less from the larger reading.
12 + 8 = 20 ° amplitude
The average temperature is calculated as follows: add up all the readings and divide the resulting number by the number of readings.
(12 + (- 4) + 0 + 10 + 15) / 5 = 6.6