Answer:
11.4%
Explanation:
Given that,
Average annual return on the S&P 500 Index from 1986 to 1995 = 16.20%
Average annual T-bill yield during the same period = 4.80%
Market risk premium is the difference between the expected return on the portfolio (market) and the risk free return.
Therefore,
Average market risk premium = Return on market - risk free return
= 0.1620 - 0.048
= 0.114 or 11.4%