Basic Probabilistics (1, 1, 2, 8) The population of construction materials according to its quality level is given below: Total Grade A 42 Grade B Material X 36 78 Material Y 18 52 88 70 148 Total 60 If a worker wants to purchase these materials to construct a school. Considering the quality of the material into his decision, what is the probability that he chooses: a) Material X b) Material Y

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