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kita cari rata-ratanya terlebih dahulu
rata-rata = (3 + 4 + 5 + 6 + 7 + 8 + 9) / 7
= 42 / 7
= 6
kemudian kita cari ragam atau variannya (S²)
S² = {(3 - 6)² + (4 - 6)² + (5 - 6)² + (6 - 6)² + (7 - 6)² + (8 - 6)² + (9 - 6)²} / 7
= {(-3)² + (-2)² + (-1)² + 0² + 1² + 2² + 3²} / 7
= (9 + 4 + 1 + 0 + 1 + 4 + 9) / 7
= 28 / 7
= 4
standar deviasi = √varian
= √4
= 2
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kelas : XI SMA
mapel : matematika
kategori : statistika
kata kunci : simpangan baku
kode : 11.2.1 [matematika SMA kelas 11 Bab 1 statistika]
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