simpangan baku dari data : 2,1,3,6,1,4,2,5 adalah...

cari rata2 nya dulu
[tex] \frac{24}{8} = 3[/tex]
cari ragam dulu
[tex] \frac{ {2.(2 - 3)}^{2} + 2. {(1 - 3)}^{2} + (3 - 3 {)}^{2} + (6 - 3 {)}^{2} + {(4 - 3)}^{2} + {(5 - 3)}^{2} }{8} \\ = \frac{2. { - 1}^{2} + 2. - {2}^{2} + {0}^{2} + {3}^{2} + {1}^{2} + {2}^{2} }{8} [/tex]
[tex] = \frac{2 + 8 + 0 + 9 + 1 + 4}{8} \\ = \frac{24}{8} \\ = 3 [/tex]
maka simpangan baku nya,
[tex] \sqrt{ragam} = \sqrt{ 3} [/tex]