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OpenStudy (anonymous):
Each trial of a certain lab procedure is scored 0 (total failure), 1 (marginal result), 2 (good result), or 3 (excellent result) according to the population distribution: x 0 1 2 3 f(x) 0.1 0.2 0.4 0.3 Let 3 denote the sample mean score from two independent trials of this procedure. What's the probability that X-bar will equal 1.5? Answer: 0.22
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