• Choice E

    Difference between the high and low temperature of Monday =26°(3°)=29°;

    Difference between the high and low temperature of Tuesday =32°(5°)=37°;

    Difference between the high and low temperature of Wednesday =22°(7°)=29°;

    Difference between the high and low temperature of Thursday =40°3°=37°;

    Difference between the high and low temperature of Friday =40°2°=38°;

    Therefore, the mean of the differences =29°+37°+29°+37°+38°5=34°

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