$6.(2$ points$)$ All else the same, which curve in the figure below has less variability?

$7.(2$ points$)$ In a pull system, if demand is below capacity, what is the utilization of the slowest machine?

a$)$ Less than $100\%$

b$)$ Answer $100\%$

c$)$ More than $100\%$

d$)$ None of the above

a$)$ System A

b$)$ System B