The Domain is always the x values and the range is alway the y values. For example (3,0) the domain is 3 and the range is 0. Hope this helps!
Total number of computers in sample = 72 + 112 + 711 = 895.
P(LQ) = 72/895 = 0.08
P(MQ) = 112/895 = 0.125
P(HQ) = 711/895 = 0.794
One line of symmetry an isosceles trapezoid has