Compressive strength (in thousand psi) was measured on 60 specimens of a new aluminum alloy undergoing development as a material for the next generation of aircraft. 66.4 67.7 68.0 68.0 68.3 68.4 68.6 68.8 68.9 69.0 71.9 72.1 72.2 72.3 72.4 69.2 69.3 69.3 69.5 69.5 69.6 69.7 69.8 69.8 69.9 72.6 72.7 72.9 73.1 73.3 70.0 70.1 70.2 70.3 70.3 70.4 70.5 70.6 70.6 70.8 74.2 74.5 75.3 70.4 68.8 71.0 71.1 71.2 71.3 71.3 71.5 71.6 71.6 71.7 71.8 69.5 67.3 72.5 70.2 73.2 :

(33) The range of data isA 60 B -10.2 C 9.8 D 8.9 (34) The interquartile rang of data isA 2.53 B 3.36 C 1.83 D 2.59 (35) The variance of data isA 2.53 B 3.36 C 1.83 D 2.59