Random Variables

We estimate MA12-RV is worth about 14 marks out of 100 under the new Mathematics Advanced syllabus. Practise 60 exam-style questions (multiple choice, multi-part, numerical answer) with instant marking and a worked solution for every question.

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Example questions

Example 1 · 1 mark · multiple choice

A discrete random variable $X$ has $P (X = 0) = 0.2$ , $P (X = 1) = 0.5$ and $P (X = 2) = 0.3$ . What is $E (X)$ ?

A1
B1.1
C1.5
D0.9

Example 2 · 1 mark · multiple choice

A discrete random variable has $P (X = x) = k x$ for $x = 1, 2, 3, 4$ . What is $k$ ?

A $\frac{1}{24}$
B $\frac{1}{10}$
C $\frac{1}{4}$
D $10$

Example 3 · 1 mark · multiple choice

A discrete random variable has $P (X = x) = \frac{x}{10}$ for $x = 1, 2, 3, 4$ . What is $E (X)$ ?

A $1$
B $2.5$
C $3$
D $30$

Answers and worked solutions appear when you practise these questions.

Random Variables

Example questions

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