9709 P52 - Mar 2022 - Q1
2961
A fair red spinner has edges numbered 1, 2, 2, 3. A fair blue spinner has edges numbered -3, -2, -1, -1. Each spinner is spun once and the number on the edge on which each spinner lands is noted. The random variable X denotes the sum of the resulting two numbers.
(a) Draw up the probability distribution table for X.
(b) Given that \(E(X) = 0.25\), find the value of \(\text{Var}(X)\).
