Mathematics 9709 · AS & A Level · Linear combinations of random variables

Linear combinations of random variables — practice question

The discrete random variable $X$ is described by the probability distribution shown below.
(i)[4]

Given that $\text{E}(X) = 1.7$, Find the values of $p$ and $q$.

(ii)[2]

Find $\mathrm{Var}(X)$.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI