(main)[3]
Using one diagram, and with the horizontal axis running from $0$ to $70$, sketch the three curves that show the distributions of $X$, $Y$ and $Z$.
Mathematics 9709 · AS & A Level · Continuous random variables
Continuous random variables — practice question
The information provided is that $X \sim N(30, 49)$, $Y \sim N(30, 16)$ and $Z \sim N(50, 16)$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$X$ has mean $30$, and is roughly spread from $10$ to $50$ (or $15$ to $45$)” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI