The discrete uniform distributionEdexcel International A Level Maths: Mind map

Exam questions on The discrete uniform distribution

1. A fair eight-sided spinner has faces numbered 1 to 8. The random variable $X$ is the number on the face it lands on.
   Find $\mathrm{Var}(X)$.2 marks
2. The discrete random variable $Y$ takes each of the values $1, 2, \ldots, n$ with equal probability, and $\mathrm{E}(Y)=7.5$.
   Find $\mathrm{Var}(Y)$.2 marks
3. A fair ten-sided spinner has faces numbered 0 to 9. The random variable $X$ is the number on the face it lands on.
   Find $\mathrm{E}(X)$ and $\mathrm{Var}(X)$.3 marks