Which quality control tool $(7$ QC tools$)$ would be useful for each of the following situations? $(6$ marks$)$ To rank$-$order the causes of a quality problem To brainstorm the reasons why a product might have failed To find an assignable cause To determine if a process range is under control To reduce the variability of failures found in the field under actual use of the product To achieve the smallest possible variance in the time it takes to wait on tables in a restaurant