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Mathematics, 28.07.2021 14:00 whitlee
Mức hao phí nguyên liệu của một loại sản phẩm của một nhà máy là biến ngẫu nhiên có luật phân phối chuẩn. Khảo sát ngẫu nhiên 25 sản phẩm loại này, thấy độ lêch chuẩn mẫu là 0.263 gram/sản phẩm. Với độ tin cậy 90%, hãy tìm khoảng tin cậy hai phía cho độ lệch chuẩn mức hao phí nguyên liệu của một sản phẩm loại này.
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Mức hao phí nguyên liệu của một loại sản phẩm của một nhà máy là biến ngẫu nhiên có luật phân phối c...
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