Practice variation 3 of 3

Binomial distribution — Mean and variance

This practice question was inspired by Question 13(d) in the 2025 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?