Flexural strength is a measure of a material's ability to resist failure in bending. The accompanying data are on exural strength of concrete [in MegaPascal, MPa, where 1 Pa (Pascal) = 1.45 X 1074 psi]: 5.9 7.2 7.3 6.3 8.1 6.3 7.0 7.6 6.8 6.5 7.0 6.3 7.9 9.0 8.2 8.7 7.8 9.7 7.4 7.7 9.7 7.6 7.7 11.6 11.3 11.8 10.7 (a) Construct a stern-and-leaf display of the data. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) Stern 5 Leaves What appears to be a representative strength value? Do the observations appear to be highly concentrated about the representative value or rather spread out? 0 highly concentrated around the representative value 0 spread out with a large range (b) Does the display appear to be reasonably symmetric about a representative value, or would you describe its shape in some other way? 0 reasonably symmetric 0 positive skewness 0 negative skewness 0 completely random distribution (1:) Do there appear to be any outlying strength values? 0 Yes 0 No (d) What proportion of strength observations in this sample exceed 10 MPa? (Round your answer to two decimal places.) |:|