Page 174 - Math Grade 12 (Advance)

PROEUS DARA

80 - ll) !.o. 80 - ll
P Z>-cr- = 0.0113 mw -cr- =a
(
&f:HflS P(Z >a) = 0.0113

0
&f:ht15 P(Z>2.28) = 0.5-0.4887 (m:nhti.fl)
u li1
P(Z > 2.28) = 0.0113 0 2.28

80
a = 2.28 t5 - = 2.28 ( 1)
"'" cr
tl"jlbt!tJ~ P(X>30) = 0.9713

30
p(x ~ ll > ~ ll) = o.9713

30
mh -ll = b
cr
&r:1Q1S P(Z >b) = 0.9713
tf:h t15 P(Z > -1.9) = 0.5 + 0.4713 ( m:nb M)
u li1
P(Z>-1.9) = 0.9713
30
&r:1Q1S b = -1.9 t5 -!l = -1.9 (2) -1.9 0 z
"'" cr
imtl"hl~ffU (1) Sb (2) tr:1Q1Sl_?rl~fU~ffU

80 11 2 28
; = · (1) {80-!l = 2.28cr (l)
{ 30 ~ ll = -1.9 (2) Y. 30 -!l = -1.9 (2)

80 -!l = 2.28cr (1) .. b
{ -30 + ll = 1.9cr (2) 1Jn (I) s (2) &r:1Q1S
50= 4.18cr sl~ cr = 11.96

- 30 + ll = 1.9cr s1 ~ !l = l.9cr + 30

= 1.9(11.96) + 30

= 52.72

tlmsg f1=52.72Sb cr= 11.96 '1
u

'\:) Q 0 t
P(X>50) = 0.4960 '1 r:1rulSl~ttl"tl"U1tl" !l Sbr:1rul~hlbf:h cr '1
N ~ fi1

169
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