Problem-Solving and Data AnalysisEasyProbability from a spinner
Problem-Solving and Data Analysis practice question
A spinner is divided into 12 equal sections, 3 of which are red. If the spinner is spun once, what is the probability that it lands on red?
Answer: 1/4 or 0.25 or 3/12
3 red sections out of 12 equal sections: 3/12 = 1/4.
Common wrong answers
- If you answered 3/9
- 3/9 compares red to NOT red; probability compares red to all 12.
- If you answered 1/3
- 1/3 divides 3 by 9 or 12 by 4 — a slip; 3/12 = 1/4.
- If you answered 9/12
- 9/12 is the probability of NOT red.
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