Paper 2 · Statistics ⏱ Tested in 5+ recent exam questions Lesson 15 of 21

Statistics 15- z scores 7

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You’ll learn

  • Reverse-look-up the z-table: scan the body for a probability, read off z
  • Convert 'top 10%' style wording into the correct left-tail probability first
  • Rearrange the standardising formula to x = μ + z·σ or x̄ = μ + z·(σ/√n)
  • Find cutoff and threshold values for both individuals and sample means

Most recent exam questions

  • 2025 P2 Q10(a)(ii) — deferred
  • 2024 P2 Q7(a)(ii)
  • 2023 P2 Q10(b)(ii) — deferred
  • 2022 P2 Q10(a)(ii)
  • 2021 P2 Q8(a)(i)

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