Jawabanmu

2014-04-14T21:54:45+07:00
X rata-rata = 15+16+17+17+18+19 / 6 = A
sd ( simpangan baku ) = √ ( 15-A ) ²+( 16-A )²+( 17-A )²+(17-A )²+( 18-A )²+( 19-A )² /6=.....