Consider the following data for two investments, A and $B$ :

Investment A: $\stackrel{}{x}=8$ and $s=5$

Investment $B$:$\stackrel{}{x}=10$ and $s=7$

a$-1.$ Which investment provides the higher return?

Investment A

Investment B

a$-2.$ Which investment provides less risk?

Investment A

Investment B

b$-1.$ Given a risk$-$free rate of $2\%,$ calculate the Sharpe ratio for each investment. $($Round your answers to $2$ decimal places.$)$

b$-2.$ Which investment provides the higher reward per unit of risk?

Investment $A$

Investment B