BUSINESS ENGLISH
Cau 1. (3 diém)
Cé bon hop san pham. Trong do, hop
pham A va 3 san phim B; hép III cé 9
san pham nao. Ta lay ra mot san pham
hop III, sau do ta mang tit cd san phim
hop IV ta lay Ta mot san pham dé kiém
IV la san pham A.
I co: 6 san pham Ava 4 san pham B; hop I ca: 5 san
san pham A va 6 san pham B; con hop IV khong co
tir hép I; mét san pham tir hép II va mét san pham tir
con lai tir hop I, hop Il va hép II cho vao hop IV. Tir
tra. Hay tinh xac suat sao cho san pham lay ra tir hop
Cau 2. (4 diém)
Cho .¥ 14 BNN lién tuc cé ham mat dé:
Acos(6x)
khi
we |-2.4
=
f(x=
a! Hay tim 4 va tim ham phan phoi
F(x) cho X.
b/ Hay tim ky vong va phuong saicho ¥.
Cau 3. (3 diém)
Cho ¥ 1a BNN lién tuc cé ham mat dé:
x
fiy=lea
khi
.
xe [0.4]
0 = kat xe [0,4]
Hay tinh xac suat sao cho trong 8 phép thir déc lap thi cé 3 lan Y nhan gia tri trong khoang
[3.5].
C4u 1. (3 diém)
Cé hai chuéng tho. Chuéng thir nhat cé 5 con thé den
cé 3 con thé trang va 7 con thé den. Tir chudng thir hai
chuéng thir nhat, roi sau dé lai bat ngau nhién 1 con thé
mét con thé trang. Tinh xac suat dé con thé ting nay 14
va 10 con thé tring. Chuéng thir hai
ta bat ngau nhién | con thé cho vao
tir chudng thir nhat ra, thi thay durge
cia chudng thir nhat.
Cau 2. (4 diém)
Cho ¥ 14 BNN lién tuc co ham mat dé:
fe)
x}=
Axe
khi
x20
0
khi
x <0
|
a/ Hay tim 4 va tim ham phan phdi F(x) cho X.
b/ Hay tim ky vong va phuong sai cho Y .
Cau 3. (3 diém)
Tir mét 16 hang cé 200 san pham, trong dé cé 10 phé pham, ta chon ra ngau nhién 20 san
pham dé kiém tra. Hay tinh xac suat sao cho trong 20 san phim
af Cé it nhat 3 phé pham.
b/ Cé khéng qua 10% san pham hong.
b/ Cé tir 40% dén 80% san pham tat.
lay Ta:
BUSINESS ENGLISH
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BUSINESS ENGLISH
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