9709 P52 - Jun 2021 - 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).
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