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Những chiếc lốp xe của một hãng xe đi được trung bình 56000 dặm với độ lệch chuẩn 8000 dặm và có phân phối chuẩn a) Tính tỉ lệ lốp xe đi được ít nhất 50000 dặm.
b) Tính xác suất cả 4 chiếc lốp xe trên một chiếc xe thuộc hãng này đi được ít nhất 50000 dặm.

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Những chiếc lốp xe của một hãng xe đi được trung bình 56000 dặm với độ lệch chuẩn 8000 dặm và có phâ...
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