(main)[4]
Given that $\text{E}(X) = 0.28$, determine the value of $p$ and the value of $q$.
Mathematics 9709 · AS & A Level · Discrete random variables
Discrete random variables — practice question
The probability distribution of a random variable $X$ is given in the table below.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Use the fact that the probabilities sum to $1$, for example $0.12 + p + q + 0.16 + 0.3 = 1$ (or $p+q=0.42$).” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI