School Improvement in Maryland
Sample Item Scoring Information Return

Standard 5.0 Knowledge of Probability

Topic B. Theoretical Probability

Indicator 1. Determine the probability of an event comprised of no more than 2 independent events

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

Selected Response (SR) Item

The local weather report states that the probability of snow today is 10% and snow tomorrow is 30%. What is the probability that it will snow today and snow tomorrow?

  1. .10
  2. .03
  3. 10
  4. 30

Correct Answer
B. .03

Answer Annotation

  1. .10 (snow today)
  2. .03 (correct answer)
  3. 10 (percent snow today)
  4. 30 (percent snow tomorrow)
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