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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

18

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