A sample X1, X2, ..., X25 is randomly chosen from a population of N (20 comma space 36 )and another sample Y1, Y2, ..., Y36 is randomly chosen from a population of N (30 comma space sigma squared ).

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?