问题已解决
老师,麻烦你把它列出算式的得数给我一下,我怎么得不出这个数来呢



您好!很高兴为您解答,请稍等
2023 09/15 11:37

廖君老师 

2023 09/15 11:42
您好,我计算A股票标准差(0.26-0.2245)*(0.26-0.2245)*0.1%2b(0.11-0.2245)*(0.11-0.2245)*0.1%2b(0.15-0.2245)*(0.15-0.2245)*0.2%2b(0.27-0.2245)*(0.27-0.2245)*0.25%2b(0.21-0.2245)*(0.21-0.2245)*0.2%2b(0.32-0.2245)*(0.32-0.2245)*0.15=0.00447475,然后开根号POWER(0.00447475,1/2)=0.066893572

m80258768 

2023 09/15 11:47
老师,2b是什么意思

廖君老师 

2023 09/15 11:53
您好,又显示异常了,是加号,我截图哈