$3.$ you$$ve observed the following returns on Pine Computer$$s stock over the past five years: $29\mathrm{.}7$ percent, $16\mathrm{.}8$ percent, $36\mathrm{.}6$ percent, $3\mathrm{.}9$ percent, and $22\mathrm{.}9$ percent. The average inflation rate over this period was $3\mathrm{.}39$ percent and the average T$-$bill rate over the period was $4\mathrm{.}3$ percent.

a$.$ What was the average real risk$-$free rate over this time period?

b$.$ What was the average real risk premium?