Tech$\_$Energy. The accompanying data file shows the annual returns $($in $\%)$ for a technology mutual fund and an energy mutual fund over the past $37$ years.

a$.)$Which fund had the higher average return?

b$.)$Which fund was riskier over this time period?

c$.)$Given a risk$-$free rate of $2\%,$ which fund had the higher Sharpe ratio? What does this ratio imply?