Related for Bekhorot 121:35
אפילו קרא לתשיעי עשירי אינו קדוש דאמר ליה
If, however, he does not know the disposition of the owner, he separates the amount of terumah for an average person, one in fifty.
Tosefta Terumot
[If an owner] says to his agent, "Go and separate terumah!", he separates an average amount, one fiftieth. [If the owner says] "Go and separate terumah, one fiftieth!" and [the agent inadvertently] reduces it by ten [parts] or increases it by ten [parts], his terumah is [valid] terumah, but if he intended to add [even] one [part more], his terumah is not [valid] terumah. (Ter. 4:4.)
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