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Diketahui nilai rata-rata dari 750 calon mahasiswa dalam ujian saringan masuk UG untuk mata pelajaran matematika adalah 55 dengan standar deviasi atau simpangan baku 20.

Diketahui nilai rata-rata dari 750 calon mahasiswa dalam ujian saringan masuk UG untuk mata pelajaran matematika adalah 55 dengan standar deviasi atau simpangan baku 20. Bila nilai tersebut diasumsikan berdistribusi Normal, maka tentukan probabilitasnya bahwa seorang calon mahasiswa yang dipilih secara acak akan mendapat nilai matematika :

(a) Kurang dari 80

(b) Lebih dari 45

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