Problem-Solving and Data AnalysisEasyProbability with a die
Problem-Solving and Data Analysis practice question
A fair six-sided die, numbered 1 through 6, is rolled once. What is the probability that the number rolled is less than 3?
- A. 1/3Correct
- B. 1/2
- C. 1/6
- D. 2/3
Answer: A. 1/3
The numbers less than 3 are 1 and 2 — two of six equally likely outcomes. Probability = 2/6 = 1/3.
Why the other answers are wrong
- B. 1/2
- 1/2 counts 1, 2 and 3. 'Less than 3' does not include 3 itself.
- C. 1/6
- 1/6 is the probability of one specific number; two numbers qualify here.
- D. 2/3
- 2/3 is the probability of rolling 3 or MORE (4 outcomes out of 6).
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