(main)[2]
If $P(X < 5) = \frac{20}{27}$, Find $P(3 < X < 5)$.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
The graph of the probability density function for the random variable $X$ is symmetric around the line $x = 4$.
Worked solution & mark scheme
This 2-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A suitable probability expression is $1-\frac{20}{27}$ or $\frac{20}{27}-\frac12$ or $\frac{20}{27}\left(1-\frac{20}{27}\right)$.” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI