Kurt Warner has averaged the most passing yards per attempt by a quarterback with 300+ passing attempts in a season, with 9.9 yards in 2000.

highest+ yards+per+attempt+by+a+qb+in+a+season,+minimum+300+ attempts
Interpreted as:
highest+ passing yards+per+attempt+by+a+qb+in+a+season,+minimum+300+ passing attempts

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