Consider the accompanying data on flexural strength (MPa) for concrete beams of

Question

Consider the accompanying data on flexural strength (MPa) for concrete beams of a certain type. 8.7 6.8 7.7 11.8 5.5 7.0 9.0 8.1 9.0 7.5 6.3 7.7 6.8 11.3 8.1 11.6 9.7 7.2 6.3 7.4 10.7 7.8 6.5 7.3 7.0 9.7 7.9 Calculate a point estimate of the mean value of strength for the conceptual population of all beams manufactured in this fashion. [sigma x_i = 220.4.) (Round your answer to three Places,) Calculate a point estimate of the strength value that separates the weakest 50% of all such beams from the strongest 50%. Calculate a point estimate of the population standard deviation sigma. [sigma x_i^2 = 1873.4.] (Round your answer to throe decimal places) Calculate a point estimate of the proportion of all such beams whose flexural strength exceeds 10 MPa. [Think of an observation as a "success" if it exceeds 10.] (Round your answer to three decimal places.) Calculate a point estimate of the population coefficient of variation sigma/mu. (Round your answer to four decimal places.)

Explanation / Answer

(a) point estimate is 220.4/27= 8.163

(b)

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