Exam-style question
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For independent events A and B with P(A) = 0.5 and P(B) = 0.5, find P(A and B).
- A.0.25
- B.4.25
- C.-3.75
- D.0.5
Model answer
What a good answer should say
- The correct answer is 0.25.
This answer is tied to the objective: L3 Interpret measures of central tendency and variation, extending to standard deviation; calculate standard deviation, including from summary statistics..
Explanation
Why this works
Use the explanation to connect the worked answer back to L3 Interpret measures of central tendency and variation, extending to standard deviation; calculate standard deviation, including from summary statistics..
Trace the calculation before choosing. The verified method for Central tendency and variation gives 0.25; no later explanation is allowed to change that value.
Maths method check
- Topic focus: Statistics.
- Question style: practice.
- Reasoning demand: analysis.
- Check the operation, notation, units, and final answer form against the question before moving on.
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