Problem-Solving and Data AnalysisMediumTwo spins both red
Problem-Solving and Data Analysis practice question
A spinner has three equal sections coloured red, blue, and green. It is spun twice. What is the probability that both spins land on red?
Answer: 1/9
Each spin has probability 1/3 of red, and the spins are independent: (1/3)(1/3) = 1/9.
Common wrong answers
- If you answered 1/3
- 1/3 is the probability for one spin.
- If you answered 2/3
- 2/3 adds the probabilities instead of multiplying.
- If you answered 1/6
- 1/6 comes from dividing 1/3 by 2.
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