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

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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