Question 3 - A-Level Maths

Exam Board	AQA
Module	Further AS Paper 2 Statistics (Further AS Paper 2 Statistics)
Year	2023
Session	June
Topic	Discrete Probability Distributions
Type	Apply E(aX+b) or Var(aX+b) formulas directly

3 The discrete random variable \(X\) has probability distribution

\(x\)	- 4	3	8
\(\mathrm { P } ( X = x )\)	0.2	0.7	0.1

Show that \(\mathrm { E } ( 5 X - 7 ) = 3.5\)