computer chip production process yields DRAM chips with an average life of $1,800$ hours

and $\backslash$sigma $=100$ hours. The tolerance upper and lower specification limits are $2,400$ hours and

$1,600$ hours, respectively. Is this process capable of producing DRAM chips to specification

with $3\backslash$sigma quality? If not, what is the source of failure, too much variation or a non$-$centred

distribution?