A stock has an expected return of $13\mathrm{.}19\%$ and a standard deviation of $15\mathrm{.}33\%.$ For this stock, what are the:

Upper range of $68\%$ confidence interval :

Lower range of $68\%$ confidence interval:

Upper range of $95\%$ confidence interval:

Lower range of $95\%$ confidence interval:

Upper range of $99\%$ confidence interval:

Lower range of $99\%$ confidence interval: