甲的方差=[(8-3) 2+(5-3) 2+(3-3) 2+(1-3) 2+(1-3) 2+(0-3) 2]÷6≈7.7
乙的方差=[(5-3) 2+(4-3) 2+(3-3) 2+(3-3) 2+(2-1) 2+(1-3) 2]÷6≈1.7
由于乙的方差较小,所以整齐的是乙组.
故填乙.
甲的方差=[(8-3) 2+(5-3) 2+(3-3) 2+(1-3) 2+(1-3) 2+(0-3) 2]÷6≈7.7
乙的方差=[(5-3) 2+(4-3) 2+(3-3) 2+(3-3) 2+(2-1) 2+(1-3) 2]÷6≈1.7
由于乙的方差较小,所以整齐的是乙组.
故填乙.