算sample standard deviation分母需要用（n-1）=50-1=49么

NO.PZ2022062760000004 问题如下 A risk manager is calculating the Vof a funwith a ta set of 50 weekly returns. The meweekly return estimatefrom the sample is 8% with a stanrviation of 17%. Assuming thweekly returns are inpennt anintically stribute whis the stanrviation of the meweekly return? A.0.4% B.0.7% C.2.4% 10% 中文解析周化σ=年化σ/sqrt多少周=17%/sqrt(50) = 2.4%In orr to calculate the stanrviation of the meweekly returns, we must vi the stanrviation of the return series the square root of the sample size. Therefore, the correanswer is 17%/sqrt(50) = 2.4%. The meweekly return estimatefrom the sample is 8% with a stanrviation of 17%. 这里不是说的很清楚，这50个周回报率的均值是8%，s17%？那求得是什么

NO.PZ2022062760000004 问题如下 A risk manager is calculating the Vof a funwith a ta set of 50 weekly returns. The meweekly return estimatefrom the sample is 8% with a stanrviation of 17%. Assuming thweekly returns are inpennt anintically stribute whis the stanrviation of the meweekly return? A.0.4% B.0.7% C.2.4% 10% 中文解析周化σ=年化σ/sqrt多少周=17%/sqrt(50) = 2.4%In orr to calculate the stanrviation of the meweekly returns, we must vi the stanrviation of the return series the square root of the sample size. Therefore, the correanswer is 17%/sqrt(50) = 2.4%. 这题干不是已经说了weekly return stanrviation是17%了吗？（The meweekly return estimatefrom the sample is 8% with a stanrviation of 17%. ）那为啥还要我求 stanrviation of the meweekly return?我看解析是说用平方根法则来算，那题干给出的17%应该是annualizereturn stanrviation才对呀。