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Kiểm tra ngẫu nhiên 1000 sản phẩm và thấy có 45 phế phẩm. a.Khi đó tần suất mẫu sẽ có phân phối A. N(0.45, 0.01572) B. N(0.45, 0.21052) C. Không xác định được phân phối. D. N(0.045, 0.00662

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