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Bunuel
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what did you do here?? You just violated the rules of mathematics..You cannot separate a number from its sign..
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Minus 2 degree should be inside the parentheses...
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Theory

    ➡ Range = Highest Value - Lowest Value

The minimum temperatures from Monday through Sunday in the first week of July in southern Iceland are observed to be –2°C, 4°C, 4°C, 5°C, 7° C, 9°C, 10°C

Highest Temperature = 10°C
Lowest Temperature = -2°C

Range = Highest Temperature - Lowest Temperature = 10°C - (-2°C) = 10°C + 2°C = 12°C

So, Answer will be E.
Hope it helps!

Watch the following video to Learn the Basics of Statistics

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