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QLDMath MethodsQuick questions
Unit 3: Further calculus and statistics
Quick questions on Discrete random variables, expected value and variance (QCE Mathematical Methods Unit 3)
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are random variables?Show answer
A random variable assigns a numerical value to each outcome of a probability experiment. A random variable is discrete if its possible values form a countable set (typically a list of integers).
What is expected value?Show answer
The expected value (or mean) of is the probability-weighted average of its values:
What is the Bernoulli distribution?Show answer
A Bernoulli trial has exactly two outcomes, labelled success () and failure (), with probability of success.
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