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a ) T m h s a t b ng ph n ph i ? b ) T nh E ( 2 - 3 Y
aTm h s a t bng phn phi b Tnh EY Cu i dim: Cho xN;;YB; vt TxYmodx.modY. aHy tnh gi tr ca ET bTnh xc sut PY Cu dim: Mc tiu hao nhin liu ca mt loi my xc Komatsu trong mt ca lm vic l bin ngu nhin c phn b chun vi s liu nhu sau: c mu ca; trung bnh mulit; lch hiu chinhhlit; trong c ca my hot ng qu ti so vi quy nh Hy c lng mc tiu hao trung bnh cho loi my xc Komatsu vi tin cy Nu dng mu trn c lng mc tiu hao trung bnh cho loi my xc Komatsu vi sa
aTm h s a t bng phn phi b Tnh EY Cu i dim: Cho xN;;YB; vt TxYmodx.modY. aHy tnh gi tr ca ET bTnh xc sut PY Cu dim: Mc tiu hao nhin liu ca mt loi my xc Komatsu trong mt ca lm vic l bin ngu nhin c phn b chun vi s liu nhu sau: c mu ca; trung bnh mulit; lch hiu chinhhlit; trong c ca my hot ng qu ti so vi quy nh Hy c lng mc tiu hao trung bnh cho loi my xc Komatsu vi tin cy Nu dng mu trn c lng mc tiu hao trung bnh cho loi my xc Komatsu vi sa
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