Simpangan baku dari data 6, 7, 8, 8, 5, 6, 9 adalah .....

maaf kalo Salah kak.....

Rata-rata = (6 + 7 + 8 + 8 + 5 + 6 + 9)/7 = 49/7 = 7
Ragam = [(6-7)^2 +(7-7)^2 +(8-7)^2 +(8-7)^2 +(5-7)^2 + (6-7)^2 + (9-7)^2]/7
= (1 + 0 + 1 + 1 + 4 + 1 + 4)/7
= 12/7
Simpangan baku √(12/7) = √(4.3/7) = 2√3/√7 . √7/√7 = (2/7)√21