Question: Purata masa ulangkaji yang diperuntukkan oleh pelajar yang mendapat gred A dalam kursus statistik adalah bertaburan normal dengan min 7.5 jam dan sisihan piawai

Purata masa ulangkaji yang diperuntukkan oleh pelajar yang mendapat gred A dalam kursus statistik adalah bertaburan normal dengan min 7.5 jam dan sisihan piawai 1.8 jam. Kira kebarangkalian pelajar memperuntukkan masa antara 6 dan 9 jam untuk mengulangkaji. Jangan bundarkan jawapan anda. Answer:

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