The National Climactic Data Center recorded the average high and low temperatures in 5151 major cities in the United States, between the years 19811981 and 20102010: Average Annual Temperature Data.

Based on this data, what fraction of the cities listed have average high temperatures of 80∘F80^{\circ} F or higher? Write your answer as a fraction in simplest form.

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Type a concept, like “slope” or “photosynthesis”.

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