Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type. A B C D E F G
1 6.8 7.2 3.5 7 7.8 8.1 10.7
2 5.1 11.8 6.3 9.7 9.7 7.7 6.5
3 7.4 7.3 9 3.2 3.7 11.6 7.7
4 7.2 6.3 7.9 6.3 11.3 7
(a) Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. (Round your answer to three decimal places.)
(b) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%.
(c) Calculate a point estimate of the population standard deviation σ. (Round your answer to three decimal places.)
(d) Calculate a point estimate of the proportion of all such beams whose flexural strength exceeds 10 MPa. (Round your answer to three decimal places.)
(e) Calculate a point estimate of the population coefficient of variation σ/μ. (Round your answer to four decimal places.)