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running the EV calculation for 55 vs a random doesn't take into account the hands that actually call the all in. vs hands that call the all in, obviously you are losing since all bigger pairs and some overcard hands call. that being said, the other person folds often enough that it is definitely the right move.

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True that it don't take those hands into account but I would call with pretty much anything here if I was villain. 1,76 to 1 to call if I got it right and Hero could take me for a pure steal pushing any two hands against me since it would be a huge addition to his stack if I fold. Of course, the higher cards the more likely I am to call but ok. That calculation may be misguiding by a few % but not by much.