NO.PZ202106160300003004
问题如下：
The standard deviation of the 10 years of returns is closest to:
选项：
A.2.40% B.2.53% C.7.58%解释：
B is Correct.
The standard deviation is the square root of the sum of the squared deviations divided by n-1
如题
NO.PZ202106160300003004 问题如下 The stanrviation of the 10 years of returns is closest to: A.2.40% B.2.53% C.7.58% B is Correct. The stanrviation is the square root of the sum of the squareviations vin-1 RT，谢谢
NO.PZ202106160300003004计算器里有sx 和 sigma 什么时候用哪个呢
NO.PZ202106160300003004 如题。。。。。。。。。
NO.PZ202106160300003004样本和整体怎么去区分
