Amanufacturer of camping gear wishes to buy rivets whose breaking strength must exceed 6000 psi. otherwise, the rivet is considered defective. the breaking strength of rivets is normally distributed. manufacturer rosie riveter (rr) produces rivets with a mean breaking strength of 7500 psi and a standard deviation of 525 psi. manufacturer rivet runs through it (rt) produces rivets with a mean breaking strength of 6800 psi and a standard deviation of 330 psi.
does rt produce the lowest fraction of defective rivets?