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Cần kiểm định giả thuyết: "Mức giá trung bình đã thay đổi so với mức 120 (nghìn)", với giá phân phối Chuẩn.Điều tra mẫu kích thước 100 được trung bình mẫu là 118, phương sai mẫu là 10.
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