# chg5 - Y = f(X Y = f(X a Tröôøng hôïp X laø ñaïi...

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Unformatted text preview: Y = f(X) Y = f(X) a- Tröôøng hôïp X laø ñaïi löôïng ngaãu nhieân rôøi raïc vaø öùng vôùi caùc giaù trò khaùc nhau cuûa X ta coù caùc giaù trò khaùc nhau cuûa Y Thí duï 1 Thí duï 1 : : Ñaïi löôïng ngaãu nhieân X coù baûng phaân phoái xaùc suaát nhö sau: X 2 3 4 P 0,3 0,5 0,2 Tìm qui luaät phaân phoái xaùc suaát cuûa Y = 2X + 5 Giaûi: Giaûi: Caùc giaù trò maø Y coù theå nhaän laø: y 1 = 2*2 + 5 = 9; y 2 = 3*2 + 5 = 11; y 3 = 4*2 + 5 = 13; P(Y= 9) = P(X= 2) = 0,3; P(Y= 11) = P(X= 3) = 0,5; Vaäy phaân phoái xaùc suaát cuûa Y nhö sau: Y 9 11 13 P 0,3 0,5 0,2 b- b- Neáu töông öùng vôùi hai giaù trò Neáu töông öùng vôùi hai giaù trò cuûa X ta coù moät giaù trò cuûa Y cuûa X ta coù moät giaù trò cuûa Y Thí duï 2 Thí duï 2 : : Ñaïi löôïng ngaãu nhieân X coù baûng phaân phoái xaùc suaát nhö sau: Tìm qui luaät phaân phoái xaùc suaát cuûa Y = X 2 + 3 X-2 1 2 P 0,1 0,4 0,5 Khi X= - 2 thì Y= (- 2) 2 + 3 = 7; Khi X= 1 thì Y= 1 2 + 3 = 4; Khi X= 2 thì Y= 2 2 + 3 = 7; Giaûi Giaûi : : Nhö vaäy: (Y= 7) = (X= - 2) ∪ (X= 2) Do ñoù: P(Y= 7) = P(X=- 2) + P(X= 2) = 0,6 P(Y = 4) = P(X = 1) = 0,4 Va ä y qui lua ä t phaâ n phoái xaùc sua á t cuûa Y nhö sau: Y Y 4 7 P P 0,4 0,6 Y = Y = ϕ ϕ (X, Z) (X, Z) Thí duï Thí duï : : Xaùc suaát ñeå maùy thöù nhaát saûn xuaát ñöôïc saûn phaåm loaïi A laø 0,8. Xaùc suaát naøy ñoái vôùi maùy thöù hai laø 0,7. Cho maùy thöù nhaát saûn suaát 3 saûn phaåm vaø maùy thöù hai saûn xuaát 1 saûn phaåm....
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chg5 - Y = f(X Y = f(X a Tröôøng hôïp X laø ñaïi...

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