五五分 is a fixed expression meaning 'fifty-fifty' or 'equal split'. You'll most often hear it in financial or business contexts, such as 五五分账 ('split the profits equally'), or when describing even odds in a competition. It's a shorthand for 五五分成, where the two 五 stand for 50% each. The POS tag in the source data is 't' (likely a time word or other), but this is actually an idiomatic expression used as an adverb or adjective in contexts like 我们五五分 ('we split it fifty-fifty').