a$.$ 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$.,32\mathrm{.}16.$

b$.$ 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$.,32\mathrm{.}16.$

c$.$ What was the average real return for Treasury bills over this period?

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$.,32\mathrm{.}16.$