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June 2021 p52 q4
2889
A fair spinner has sides numbered 1, 2, 2. Another fair spinner has sides numbered -2, 0, 1. Each spinner is spun. The number on the side on which a spinner comes to rest is noted. The random variable X is the sum of the numbers for the two spinners.
(a) Draw up the probability distribution table for X.
(b) Find E(X) and Var(X).
Solution
(a) To find the probability distribution of X, we consider all possible outcomes from spinning the two spinners: