求4组数据的方差
来源:百度知道 编辑:UC知道 时间:2024/05/29 18:32:28
2.70.20 66.03 54 73.08 70.68
3.61.20 64.68 71.44 61.56 66.99
4.53.46 67.20 56.70 69.30 70.68
本人奋斗N分钟,得出以下内容:
1.平均数为337.17/5=67.434
方差 =(3.754平方+0.966平方+1.404平方+4.266平方+0.606平方)/5
=(14.092516+0.933156+1.971216+18.198756+0.367236)/5
=35.56288/5
=7.112576
2.平均数为333.99/5=66.798
方差 =(3.402平方+0.768平方+12.798平方+6.282平方+3.882平方)/5
=(11.573604+0.589824+163.788804+39.463524+15.069924)/5
=230.48568/5
=46.097136
3.平均数为325.87/5=65.174
方差 =(3.974平方+0.494平方+6.266平方+3.614平方+1.816平方)/5
=(15.792676+0.244036+39.262756+13.060996+3.297856)/5
=71.65832/5
=14.331664
4.平均数为317.34/5=63.468
方差 =(10.008平方+3.732平方+6.768平方+5.832平方+7.212平方)/5
=(100.160064+13.927824+45.805824+34.102224+52.012944)/5
=246.00888/5
=49.201776
(我用计算器算的...汗..脑细胞都要死完了...我爸就看到我在电脑前一直碎碎念......)
希望能对你有所帮助!!
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