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Contoh 2

Apakah kebarangkalian memperolehi skor lebih besar daripada 700

pada ujian GMAT jika min ialah 494 dan sisihan piawai 100?

P(X > 700)| = 494 dan = 100) = ?

X > 700

Z

X -

700- 494

100

206

100

2.06

= 494

= 100

X = 700

0.4803

0.500

0.0197

Dari jadual Z:

Z=2.06 -> 0.4803

P(Z>2.06) = 0.5000 - 0.4803

= 0.0197

14

Z=0

Z=2.06

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