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 one simple event comprised of equally likely outcomes

Objective b. Express the probability of an event as a decimal

Selected Response (SR) Item

A desk drawer contains 6 black pens, 5 blue pens, 4 red pens, and 5 green pens. Ron picks one pen from the drawer without looking. What is the probability Ron picks a blue pen?

  1. 0.05
  2. 0.10
  3. 0.25
  4. 0.50

Correct Answer
C. 0.25

Answer Annotation

  1. 0.05 (5 blue pens)
  2. 0.10 (10%)
  3. 0.25 (Correct answer)
  4. 0.50 (50 %)
/share/assessment_items/xml/items/msa_math_6_022.xml