At 07:27 AM 8/3/98 -0500, you wrote:
>>Vo+'i ga^`n 50% tre^n 30 tuo^?i (gia? su+? so^' na`y chia dde^`u 50%
>>so^'ng
>>o+? hai phi'a Nam, Ba('c vi~ tuye^'n 17 tru+o+'c na(m 75) thi` co'
i't
>>nha^'t
>>99,99% trong so^' 50% o+? mie^`n Ba('c va` 90% trong so^' 50% o+?
mie^`n
>>Nam,
>>kho^ng ca?m tha^'y chu't gi` nhu.c nha~ khi kho^ng cha.y ddu+o+.c ra
>>nu+o+'c
>>ngoa`i. (dda^y hoa`n toa`n la` ca'c con so^' chu? quan)
>>
>>To^?ng cu?a so^' na`y nhu+ va^.y la` : 50% + (99.99%*50% +
90%*50%)*50%
>>~
>>97,5%.
Hello,
Ba'c ti'nh toa'n gi` ma` hay va^.y? OK,
dde^? tui la^?m ca^?m la`m la.i ba(`ng ca'c
con so^' cu?a ba'c nhe'. Gia? su+? nhu+ ta co'
to^?ng so^' da^n la` 2000 ngu+o+`i; trong ddo'
co' 1000 tre^n 30 tuo^?i, 50% Nam va` 50% Ba('c.
Let us tabulate them in a table as follows:
South North Total
To^?ng so^' 2000
N >30 yrs old 500 500 1000
Ti? le^. xa^'u ho^? .9999 .90
N xa^'u ho^? 500 450 950
Nhu+ va^.y thi` ty? le^. xa^'u ho^? la`
950/2000 = 47.5%, chu+' sao la.i 97.5% ha?
ba'c?
Ba'c ru't ra ddu+o+.c ba`i ho.c gi`
tu+` ca'ch ti'nh na`y chu+a?
Nhie^`u khi ddo.c ba'o VN ma` tui
buo^`n cu+o+`i; ho. la`m nh~ con so^' tho^'ng
ke^ chi'nh xa'c dde^'n 2 decimal places. Thu'
tha^.t vo+'i ca'c ba'c, ma^'y ca'i loa.i
quoting numbers kie^?u na`y chi? la`m la.c
dde^` chu+' cha? informative ca'i qua'i gi`
ca?. Ta.i sao kho^ng no'i pha^n nu+?a da^n
so^' la`m X, ma` la.i no'i 49.56% la`m X.
Ba'o chi' vie^'t cho dda.i chu'ng ddo.c chu+'
co' pha?i cho scientists dda^u? Ma` ngay ca?
scientists cu~ng cha? ai care ca'i chi'nh
xa'c na`y which is itself often questionable.
Ba'c TPham no'i qua' chi' ly'!!!
==
Tuan V Nguyen
Email: rknguyen@yahoo.com
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