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某校要从901、902两班各选一人参加市初中数学竞赛.经过预选赛,901班的张三、李四,902班的王五、赵六脱颖而出.然后学校对这四人进行训练并每周测试一次(满分100分),共测试了5次,成绩(单位:分)如下表:那么,901班、902班到底该派谁参赛呢?领导甲很快计算出甲班的两位同学5次成绩的方差.张三:s~2=2.李四:s~2=14.56.领导甲认为,张三的成绩比李四更稳定,甲班
A school shall select one person from two classes of 901 and 902 to participate in the city junior high school math competition. After the qualifier, 901 classes of Zhang San and Li Si, 902 classes of Wang Wu and Zhao Liu come to the fore. Then the school trains the four people. Tested once a week (out of 100 points), a total of five tests were conducted, and the results (units: points) are as follows: Then, who should be sent for 901 classes and 902 classes? Leader A quickly calculated two of class A. The variance of the student’s five grades. Zhang San: s~2=2. Li Si: s~2=14.56. Leader A believes that Zhang San’s performance is more stable than Li Si’s.