Allowable mechanical properties for structural designof metallic aerospace vehicles

Chapter 1, Problem 13

(choose chapter or problem)

Allowable mechanical properties for structural designof metallic aerospace vehicles requires an approvedmethod for statistically analyzing empirical test data.The article Establishing Mechanical PropertyAllowables for Metals (J. of Testing and Evaluation,1998: 293299) used the accompanying data on tensileultimate strength (ksi) as a basis for addressingthe difficulties in developing such a method.122.2 124.2 124.3 125.6 126.3 126.5 126.5 127.2 127.3127.5 127.9 128.6 128.8 129.0 129.2 129.4 129.6 130.2130.4 130.8 131.3 131.4 131.4 131.5 131.6 131.6 131.8131.8 132.3 132.4 132.4 132.5 132.5 132.5 132.5 132.6132.7 132.9 133.0 133.1 133.1 133.1 133.1 133.2 133.2133.2 133.3 133.3 133.5 133.5 133.5 133.8 133.9 134.0134.0 134.0 134.0 134.1 134.2 134.3 134.4 134.4 134.6134.7 134.7 134.7 134.8 134.8 134.8 134.9 134.9 135.2135.2 135.2 135.3 135.3 135.4 135.5 135.5 135.6 135.6135.7 135.8 135.8 135.8 135.8 135.8 135.9 135.9 135.9135.9 136.0 136.0 136.1 136.2 136.2 136.3 136.4 136.4136.6 136.8 136.9 136.9 137.0 137.1 137.2 137.6 137.6137.8 137.8 137.8 137.9 137.9 138.2 138.2 138.3 138.3138.4 138.4 138.4 138.5 138.5 138.6 138.7 138.7 139.0139.1 139.5 139.6 139.8 139.8 140.0 140.0 140.7 140.7140.9 140.9 141.2 141.4 141.5 141.6 142.9 143.4 143.5143.6 143.8 143.8 143.9 144.1 144.5 144.5 147.7 147.7a. Construct a stem-and-leaf display of the data byfirst deleting (truncating) the tenths digit and thenrepeating each stem value five times (once forleaves 1 and 2, a second time for leaves 3 and 4,etc.). Why is it relatively easy to identify a representativestrength value?b. Construct a histogram using equal-width classeswith the first class having a lower limit of 122 and anupper limit of 124. Then comment on any interestingfeatures of the histogram.