WPN, 250/500 blinds, 65 ante No Limit Hold'em Tournament, 9 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

SB: 16,851 (33.7 bb)
BB: 26,540 (53.1 bb)
UTG+1: 4,915 (9.8 bb)
UTG+2: 15,570 (31.1 bb)
Hero (MP1): 18,747 (37.5 bb)
MP2: 15,665 (31.3 bb)
MP3: 28,116 (56.2 bb)
CO: 5,000 (10 bb)
BTN: 21,004 (42 bb)

Preflop: Hero is MP1 with 9 9
2 folds, Hero raises to 1,120, MP2 folds, MP3 raises to 3,420, 4 folds, Hero calls 2,300

Flop: (8,175) 6 7 6 (2 players)
Hero checks, MP3 bets 24,631 and is all-in, Hero folds

Results: 8,175 pot
Final Board: 6 7 6
Hero mucked 9 9 and lost (-3,485 net)
MP3 mucked and won 8,175 (4,690 net)

I'm a cash game player, starting playing mtts in the last monthys.
I don't rebember very well which level it was. But it was almost ITM situations.
The villain was new at the table, no stats.
1- std 3b call?
2- I'm not sure about his range. I put him on a linear range like 8%. I solve using the GTO+, and we have to call with a frequency of 50%.
But what we should do in a MTT situation?
THank you, guys