School Improvement in Maryland
Sample Item Scoring Information Return

Standard 5.0 Knowledge of Probability

Topic C. Experimental Probability

Indicator 1. Analyze the results of a probability experiment

Objective a. Make predictions and express the experimental probability as a fraction, a decimal, or a percent

Selected Response (SR) Item

Marla rolled a number cube 30 times and her results are shown below.

4 5 1 3 6 3 4 2 3 5
1 2 2 2 6 5 3 5 4 1
6 5 2 3 4 1 5 3 3 1

Based on her results, what is the experimental probability that Marla will roll an even number on her next roll?

  1. 0.12
  2. 0.18
  3. 0.40
  4. 0.60

Correct Answer
C. 0.40

Answer Annotation

  1. 0.12 (number of even rolls)
  2. 0.18 (number of odd rolls)
  3. 0.40 (correct answer)
  4. 0.60 (probability of rolling an odd number)
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