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← 2024 HSC Extension 1 paper Question 12(c)

Variation 2 · answer guide

Binomial distribution — Different threshold percent

Question

With , , approximate using and .

This practice question was inspired by Question 12(c) in the 2024 NSW HSC Mathematics Extension 1 examination, © NESA. It is an original TestMum variation that practises the same mathematical idea, not an official NESA question.

Step by step

  1. Set up the solution: identify the random variable and its parameters before using the matching probability formula., .
  2. Finish the calculation, then check that the result meets the question’s conditions..
  3. State the final answer clearly in the form the question requested.Answer: .

Common mistake: changing so many features that the new example no longer tests the same mathematical idea.

Verification: Same normal-approximation structure as the exam.

Any mark labels are a TestMum study aid, not an official NESA marking allocation.

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