TEAS Math · Practice Question

    Probability: TEAS Practice Question with Answer & Explanation

    An original TEAS 7-style math practice question, written for nursing-school applicants — with a full breakdown of every answer choice.

    Question

    A bag contains 3 red and 7 blue marbles. What is the probability of drawing a red marble?

    • A.3/7
    • B.3/10
      Correct
    • C.7/10
    • D.1/3

    Correct answer: B. There are 3 favorable outcomes among 10 total marbles, giving 3/10.

    Why B is correct

    There are 3 favorable outcomes among 10 total marbles, giving 3/10.

    TEAS skill review

    This question tests probability, a concept that can appear in the TEAS math section. Read the prompt carefully, identify the rule or evidence being tested, and eliminate options that do not directly satisfy it.

    Why the other choices are incorrect

    The remaining choices conflict with the relevant fact, calculation, language convention, or passage evidence. Check every option against the exact wording of the question rather than choosing an answer that is only generally related to the topic.

    Quick study tip: Probability is favorable outcomes over total outcomes.

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