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Andaikan purata harga minyak dunia ialah USD80 setong dengan sisihan piawai USD15. Jika data yang mengandungi harga minyak dunia selama 50 hari dikumpulkan, berapakah kebarangkalian

Andaikan purata harga minyak dunia ialah USD80 setong dengan sisihan piawai USD15. Jika data yang mengandungi harga minyak dunia selama 50 hari dikumpulkan, berapakah kebarangkalian purata harga minyak dunia (a) melebihi USD75 setong? (b) antara USD82 hingga USD85 setong?

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