问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，sample variance是怎么算出来的呢？谢谢
NO.PZ2017092702000156 老师这个题怎么用计算器求解 能写下详细步骤不
NO.PZ2017092702000156 可以求解下这道题的详细解题过程么 列公式计算的那种
12.04%. 24.54% C is correct. The sample varianis finesum of the squareviations from the sample mevithe sample size minus one, anthe sample stanrviation equals the square root of the sample variance. The sample varianis thus equals to 6.02. The square root of the sample varianis the sample stanrviation anequals to 24.54%. A is incorrebecause it is the sample varianfor VWGIX, not its sample stanrviation. B is incorrebecause it represents the sum of the squareviations from the mean, not the sample stanrviation. 我用计算器输出方差是24.53%.不是求平方根吗，具体什么思路啊
请问如何删除掉以前【2n7所输入的数据
2n7 输入-0.67，是算不出来的吧，再按2n8 得到的是Error
