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Cho bảng phân phối xác suất về lợi nhuận của một doanh nghiệp (X: đơn vị tỷ đồng, số âm tương ứng với bị lỗ) như sau:X/-2/-1/0/2/4/6Xác suất/0,1/0,1/0,2/0,3/0,2/?Khi đó kỳ vọng E(X) của lợi nhuận là:
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