| Exam Board | WJEC |
|---|---|
| Module | Unit 2 (Unit 2) |
| Year | 2018 |
| Session | June |
| Marks | 2 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Binomial Distribution |
| Type | Direct binomial probability calculation |
| Difficulty | Easy -1.2 This is a straightforward application of the binomial probability formula requiring only direct substitution into P(X=r) = nCr × p^r × (1-p)^(n-r) with given values. It's a routine 2-mark calculation with no problem-solving element, making it easier than average but not trivial since it requires careful arithmetic with the binomial coefficient and powers. |
| Spec | 2.04b Binomial distribution: as model B(n,p)2.04c Calculate binomial probabilities |
The random variable $X$ has the binomial distribution B(16, 0·3).
Showing your calculation, find $P(X = 7)$. [2]
\hfill \mbox{\textit{WJEC Unit 2 2018 Q01 [2]}}