| Exam Board | Edexcel |
|---|---|
| Module | S1 (Statistics 1) |
| Marks | 4 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Probability Definitions |
| Type | Basic probability calculation |
| Difficulty | Easy -1.8 This is a pure recall question testing basic definitions from probability theory. Students need only state memorized facts about sample spaces and probability functions (non-negativity and sum to 1), with no calculation, application, or problem-solving required. This is significantly easier than typical A-level questions. |
| Spec | 2.03a Mutually exclusive and independent events5.02a Discrete probability distributions: general |
| Answer | Marks | Guidance |
|---|---|---|
| (a) The set of all possible outcomes of an experiment | B2 | |
| (b) \(f(x) \geq 0\) for all \(x\), \(\sum f(x) = 1\) | B1 B1 | 4 marks total |
(a) The set of all possible outcomes of an experiment | B2 |
(b) $f(x) \geq 0$ for all $x$, $\sum f(x) = 1$ | B1 B1 | 4 marks total\begin{enumerate}[label=(\alph*)]
\item Briefly explain what is meant by a sample space. [2 marks]
\item State two properties which a function $f(x)$ must have to be a probability function. [2 marks]
\end{enumerate}
\hfill \mbox{\textit{Edexcel S1 Q1 [4]}}