Year Chevron Caterpillar

$135\%14\%$

$220\%30\%$

$33\%30\%$

$415\%55\%$

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

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

c$.$ Given a risk$-$free rate of $1\%,$ which fund has the higher Sharpe ratio? What does this imply?