( )
. 40 , 2% 20.
.(1)
(2)
' .
-_-
-mu sigma, -X.
40 = mu + 2sigma
:P(X<20) =0.02X-mu/sigma .
P(x<20) = P((x-mu)/sigma<(20-mu)/sigma) = 0.02
(20-mu)/sigma.
.
' ' -12/05/11 -05/07/12.
Medieval Ages
Journey to The Past, - Agaisnt the Jammuza
, , Martin's Story.
.
: ( , )
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2%
z 0.98
x+2o=40
(o )
: :P
. , . :
Y = (X-mu)/sigma
-20 , t, :P(Y<t) = 0.02-
P(Y > t) = 0.98
P(Y>t)=P(Y<-t)
.
' ' -12/05/11 -05/07/12.
Medieval Ages
Journey to The Past, - Agaisnt the Jammuza
, , Martin's Story.
.
: ( , )
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:
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1 . (0 -1 )