Table:
text: 1971 U.S. Open (golf)
First round
First round
Place Player Country Score To_par
T8 Leonard Thompson United States 70 E
T8 Lee Trevino United States 70 E
T8 Tom Weiskopf United States 70 E

text: 1971 U.S. Open (golf)
First round
First round
Place Player Country Score To_par
1 Labron Harris United States 67 –3
T2 Bob Goalby United States 68 –2
T2 Doug Sanders United States 68 –2
T2 Lanny Wadkins (a) United States 68 –2
T5 Jim Colbert United States 69 –1
T5 Jack Nicklaus United States 69 –1
T5 Bobby Nichols United States 69 –1
T8 Gay Brewer United States 70 E
T8 Charles Coody United States 70 E
T8 Dale Douglass United States 70 E
T8 Ralph Johnston United States 70 E
T8 Johnny Miller United States 70 E
T8 Chi-Chi Rodríguez United States 70 E
T8 John Schlee United States 70 E

Question: What is the average first round score of player Lee Trevino at the 1971 US Open (Golf) who has a t8 place?