Final answer:
Without context, it is unclear what 'a 50' refers to, but if it's about a score or percentage, the contractor might indeed be required to have at least 50% to be considered passing. The requirement's truth depends on the specific context and standards applied.
Step-by-step explanation:
The question "The contractor must have at least a 50?" is incomplete and lacks context. However, if we assume the question refers to a minimum score or percentage that a contractor must attain to be considered qualified or to pass a certain criterion, then the statement can be addressed.
In the context of, for example, a certification exam where a contractor must achieve a minimum score to pass, saying that the contractor must have at least a 50 might indeed be true. This would be the case if the passing mark is set at 50%. On the other hand, if this number refers to something else, like years of experience, needed insurance coverage, or any other measurement that cannot be quantified with a percentage score, then the assertion could be false. The general principle in such situations is to have clarity about what the '50' refers to, and the standards or requirements set by the relevant authority.