excel how to show normal return what is average xi return in excel how to calculate confidence interval from a normal distribution excel what is the confidence interval for investment in excel what is the confidence interval for a futures fund average annual growth of futures average random returns excel what is normal confidence interval what percentage of my investment is a normal return normal distribution excel average confidence intervals for investing what is the confidence interval for random returns in excel average annual return x how to calculate random investment returns in excel average confidence interval for investment how to calculate random investment returns in excel how much is the confidence interval for investment returns what is normal deviation from normal distribution what is normal distribution in excel for a year when do you calculate normal return