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QLDMath MethodsQuick questions

Unit 4: Further calculus and statistical inference

Quick questions on Continuous random variables and pdf: QCE Maths Methods Unit 4

2short 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 is wrong variance formula?
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Var=E(X2)−[E(X)]2\text{Var} = E(X^2) - [E(X)]^2, not E(X2)−E(X)E(X^2) - E(X).
What is wrong support?
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If f=0f = 0 outside [a,b][a, b], the integrals must be on [a,b][a, b], not (−∞,∞)(-\infty, \infty).

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