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Contoh 3

Bagi ujian GMAT yang sama, apakah

kebarangkalian skor kurang daripada 550?

P(X <550)| = 494 dan = 100) = ?

Z

X -

550 - 494

100

56

100

0.56

= 494

= 100

X=550

Keluasan di bawah keluk bagi

Z = 0.56 ialah 0.2123

15

0.500 0.2123 P(X <550) = P(Z < 0.2123)

= 0.5000 + 0.2123

= 0.7123

Z=0

Z=0.56

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