Discrete random variable questions in trial papers give a probability table with unknowns. You find the unknowns, then the mean, variance, standard deviation and probabilities, and sometimes the expected gain in a game. These questions cover each type. Tap Show a hint for one step at a time.
Sign in to take HSC practice
13 questions with instant marking. It is free, and your scores are saved to your account so you can carry on from any device.
Turn on JavaScript to sign in and take the quiz.