A 2-mark, no-calculator question. P(X = x) = k(x + 1) for x = 0, 1, 2, 3: find k. The probabilities are k, 2k, 3k and 4k, and they add up to 1: 10k = 1, so k = 1/10. The table reads 0.1, 0.2, 0.3, 0.4.
One question, one step, full marks: the kind of question that opens IB Math Paper 1.
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