9709 P53 - Jun 2020 - Q4
2895
A fair four-sided spinner has edges numbered 1, 2, 2, 3. A fair three-sided spinner has edges numbered -2, -1, 1. Each spinner is spun and the number on the edge on which it comes to rest is noted. The random variable X is the sum of the two numbers that have been noted.
(a) Draw up the probability distribution table for X.
(b) Find Var(X).
