Ononot — If a student's scores on 4 exams are x1, x2, x3, x4 with wei

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Central Tendencymedium

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If a student's scores on $4$ exams are $x_1, x_2, x_3, x_4$ with weights $0.1, 0.2, 0.3, 0.4$ , which expression represents the weighted mean?