(main)[4]
Given that $\text{E}(X) = 3.05$, find $p$ and $q$.
Mathematics 9709 · AS & A Level · Linear combinations of random variables
Linear combinations of random variables — practice question
Shown below is the probability distribution for the discrete random variable $X$:
$x: 1,\;2,\;3,\;6$
$P(X = x): 0.15,\;p,\;0.4,\;q$
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Using the fact that the total probability is 1, set up $p+q=0.45$” …
- Full mark scheme, point by point
- Step-by-step worked solution
- Write your answer & get it marked instantly by AI