Practice variation 1 of 3
Binomial distribution — At least 3 of 4 guesses
Your question
An applicant has correct already and needs of . They randomly guess remaining four-option items. Probability of at least correct is
This practice question was inspired by Question 7 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.
Before you check
- Have you stated every choice or assumption?
- Can another student follow each line?
- Did you verify the final result independently?