1 p
p
Trang 3F(w p
p
–
p =a[
p
Trang 4k2,f r
Trang 5(w3,2)
(w2,3)
(w2,4) (w1,3)
(w3,2) (w4,3) (w3,2)
(w1,7)
(w3,4)
(w4,3)
(w1,3)
(w4,3)
(w1,3)
(w4,1)
(w1,3)
(w4,3)
(w2,3) (w1,2)
(w3,4) (w4,1)
(w3,8) (w4,7)
Trang 7(SUM(Sale),City=0-‐M/2)
(SUM(Sale),City=M/2-‐M)
(SUM(Sale),City=M/2-‐M)
(SUM(Sale),City=0-‐M/2)
(SUM(Sale),City=M/2-‐M)
Sales
Trang 9–
Trang 11•
•
•
•
•
Trang 14f
Trang 15σ D
P
σ D
P 2 × P =
σ D
P
Trang 16σ = mP
P nf
wnf
nf
n