School Improvement in Maryland
Sample Item Scoring Information Return

Standard 5.0 Knowledge of Probability

Topic B. Theoretical Probability

Indicator 2. Determine the probability of a second event that is dependent on a first event of equally likely outcomes

Objective a. Express the probability as a fraction, a decimal, or a percent

Assessment limit: Use a sample space of no more than 60 outcomes

Selected Response (SR) Item

Mr. Rosart selects two students from his class to present their book reports. He places the names of each student in a box and randomly picks one at a time. The class has 14 boys and 12 girls. What is the probability that the second name Mr. Rosart picks is a boy, if the first one is a boy also? Round your answer to the nearest percent.

  1. 46%
  2. 50%
  3. 52%
  4. 55%

Correct Answer
C. 52%

Answer Annotation

  1. 46% (14 out of 26)
  2. 50% (13 out of 26)
  3. 52% (correct answer)
  4. 55% (if the second one is a girl)
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