ragam dari data 3, 4, 5, 6, 7, 8, 8, 7. Adalah.....??

mean : 3+4+5+6+7+7+8+8/8=48/8=6
S2 = (3-6)2+(4-6)2+(5-6)2+(6-6)2+(7-6)2+(7-6)2+(8-6)2+(8-6)2/6
=9+4+1+0+1+1+4+4/6
=24/6
=4