Based on the temperature readings, the average recorded temperature in the 20 days was 10.15°
The average temperature can be found by adding all the temperatures and then dividing by the number of temperatures taken which is 20.
The average is therefore:
= 24° + (−10°) + 9° + 18° + 23° + 27° + 8° + 17° + 3° + 7° + ( −2°) + (−6°) + 2° + (−9°) + (−8°) + 21° + 25° + 15° + 10° + 29°) / 20
= 203 / 20
= 10.15°
In conclusion, the average temperature was 10.15°.
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