user: Question: What is the pr avg, when kr lg is 49?
Columns: ['Player', 'GP', 'K. Ret.', 'KR Yds', 'KR Avg.', 'KR TD', 'KR LG', 'P. Ret.', 'PR Yds', 'PR Avg.', 'PR TD', 'PR LG', 'MFG Ret.', 'MFG Yds', 'MFG Avg.', 'MFG LG', 'MFG TD']
Types: ['text', 'real', 'real', 'real', 'text', 'real', 'real', 'real', 'real', 'text', 'real', 'real', 'real', 'real', 'text', 'real', 'real']
Sample row: ['Tristan Jackson (CB)', 17.0, 35.0, 839.0, '24.0', 1.0, 94.0, 79.0, 809.0, '10.2', 2.0, 67.0, 5.0, 142.0, '28.4', 64.0, 0.0]
SQL:

assistant: SELECT "PR Avg." FROM "Table" WHERE "KR LG" = 49.0;