Consider the following table for a period of six years:

$\backslash$table$[[,$Returns$],[$Year$,$Large$-$Company,$],[1,-15\mathrm{.}49\%,$U$.$S$.$ Treasury$],[$Bills$,,]]$

a$-1.$ Calculate the arithmetic average returns for large$-$company stocks and T$-$bills over this time period.

Note: Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$ a$-2.$ Calculate the standard deviation of the returns for large$-$company stocks and T$-$bills over this time period.

Note: Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\backslash$table$[[$a$-1.$ Arithmetic average return,$\backslash$table$[[$Large$-$company$],[$stocks$]],$T$-$bills,$],[3\mathrm{.}09,\%,1],[$a$-2.$ Standard

Consider the following table for a period of six years:

$\backslash$table$[[,$Returns$],[$Year$,$Large$-$Company,$],[1,-15\mathrm{.}49\%,$U$.$S$.$ Treasury$],[$Bills$,,]]$

a$-1.$ Calculate the arithmetic average returns for large$-$company stocks and T$-$bills over this time period.

Note: Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$ a$-2.$ Calculate the standard deviation of the returns for large$-$company stocks and T$-$bills over this time period.

Note: Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\backslash$table$[[$a$-1.$ Arithmetic average return,$\backslash$table$[[$Large$-$company$],[$stocks$]],$T$-$bills,$],[3\mathrm{.}09,\%,1],[$a$-2.$ Standard deviation,$24\mathrm{.}40,\%,,\%$deviation,$24\mathrm{.}40,\%,,\%$