1两太机器生产规格相同的铝合金板，各取5个样品，测量厚度如下A:2.452.532.482.552.51B：2.362.382.482.502.42根据每组数据，说明两台机器生产的铝合金板的平均厚度是否存在差异如果标准厚

Answer 1

1.X1(均) =（2.45+2.53+2.48+2.55+2.51)/5 = 2.504 误差=2.504-2.50=0.004 < 0.5
X2(均) = (2.36+2.38+2.48+2.50+2.42)/5 = 2.428 误差=2.50-2.428=0.072
2.加到学校平均骑车圈数 = (427+439+428+438+436 +440+ 432+ 435+ 436+ 439) /10= 435
距离=435 * 100 / 22 = 1977.3 (米)
3.36000*0.25+ 30000*0.3+20000*0.4+15000*0.5=9000+9000+8000+7500=33500
36000+30000+20000+15000=101000
n= 33500/101000 = 0.33