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Contoh 6
Apakah kebarangkalian untuk mem-perolehi
skor di antara 350 dan 450 bagi ujian GMAT
yang sama?
X = 350 X=430 = 494
= 100
P(X 350 < X < 450| = 494 dan = 100) = ?
Z
X -
350- 494
100
-144
100
-1.44
Z
X -
450- 494
100
- 44
100
- 0.44
0.1700
0.2551
P(-1.44 < Z < -0.44) = 0.4251 - 0.1700
= 0.2551
0.4251
Z=-1.44 Z= -0.44
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