Consider the following table for an eight$-$year period:

Year T$-$bill return Inflation

$17\mathrm{.}37\%8\mathrm{.}63\%$

$28\mathrm{.}4412\mathrm{.}26$

$35\mathrm{.}956\mathrm{.}86$

$45\mathrm{.}474\mathrm{.}94$

$55\mathrm{.}536\mathrm{.}62$

$68\mathrm{.}048\mathrm{.}94$

$710\mathrm{.}6413\mathrm{.}21$

$812\mathrm{.}5012\mathrm{.}44$

Calculate the average return for Treasury bills and the average annual inflation rate $($consumer price index$)$ for this period.

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

Calculate the standard deviation of Treasury bill returns and inflation over this time period.

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

Calculate the real return for each year.

Note: A negative answer should be indicated by a minus sign. Leave no cells blank $-$ be certain to enter $"0"$ wherever required. Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

What is the average real return for Treasury bills?

Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$