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Contoh 4

Apakah kebarangkalian memperolehi skor

kurang daripada 400 di dalam ujian GMAT?

X=400 = 494

= 100

P(X <400)| = 494 dan = 100) = ?

X - 400- 494 - 94

Z - 0.94

100 100

P(Z<-0.94)=P(Z>0.94)

= 0.5000 – 0.3264

= 0.1735

0.5000 0.5000

0.1735 0.3264 0.3264 0.1735

16

Z=-0.94

Z=-0.94

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