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Mathematics, 17.07.2021 06:00 ryleerod07

thời gian sử dụng một chiếc điện thoại thông minh của một hãng công nghệ tuân theo phân phối mũ với thời gian sử dụng trung bình là 4 năm. tính sác xuất để một người sử dụng điện thoại thông minh của hãng này có thời gian sử dụng trên 5 năm

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