Find the probability of 
when d.f.= 19.
Definitions:
Texas Borderland
Refers to the geographic area along the border between Texas and Mexico, characterized by its distinct cultural, social, and economic interactions.
Dred Scott Case
A landmark Supreme Court case in 1857 which ruled that African Americans, whether enslaved or free, could not be American citizens and had no standing to sue in federal court.
Roger Taney
Chief Justice of the U.S. Supreme Court best known for delivering the majority opinion in the Dred Scott case, which declared African Americans could not be American citizens.
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