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. Draw up the probability distribution table for $$$X$$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_s20_qp_53 Year：2020 Question No：4(a)

Answer:

Probability distribution table with correct scores with at least one probability
At least 4 probabilities correct
All probabilities correct

5.3.2 use addition and multiplication of probabilities, as appropriate, in simple cases (Explicit use of the general formula is not required.)

5.4.1 draw up a probability distribution table relating to a given situation involving a discrete random variable X, and calculate E(X) and Var(X)