$2-$ Consider two machines with two different instruction sets. Machine A has a $2GHz$ clock and

machine $B$ has a $3GHz$ clock. The following measurements are recorded upon execution of a program.

$2-(3$ points$)$ For Machine A$,$ what is the average CPI?

$3-(3$ points$)$ For Machine B$,$ what is the average CPI?

$4-(4$ points$)$ What is the execution time for each machine and which is faster?