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Suatu pabrik aki mengklaim usia aki produksi mereka memiliki rataan 100 bulan dan simpangan baku 5 bulan. Seorang agen membeli sampel sebanyak 40 buah dan

Suatu pabrik aki mengklaim usia aki produksi mereka memiliki rataan 100 bulan dan simpangan baku 5 bulan. Seorang agen membeli sampel sebanyak 40 buah dan melakukan pengujian. Ia menemukan usia rata-rata dari sampel tersebut adalah 99 bulan, kesimpulan apa yang dapat diperoleh ? (Distribusi Sampling Rataan )

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