A survey of 50 carpenters finds that 30 are journeymen and 20 are master carpenters. Of the journeymen, 10 prefer to use hammers and 20 prefer to use nail guns. Of the master carpenters, 5 prefer using hammers and 15 prefer using nail guns. Construct a data table for this data and answer this question: Out of the entire survey, what is the probability of choosing a journeyman who prefers using a hammer?

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