An article gives arguments for why fracture toughness in concrete specimens should have a Weibull distribution and presents several histograms of data that appear well fit by superimposed Weibull curves. Consider the following sample of size n = 18 observations on toughness for high-strength concrete (consistent with one of the histograms); values of pi = (i − 0.5) 18 are also given. Observation 0.47 0.60 0.65 0.6 0.72 0.74
Pi 0.0278 0.0833 0.1389 0.1944 0.25 0.3056
Observation 0.76 0.79 0.80 0.8 0.82 0.84
Pi 0.3611 0.4167 0.4722 0.5278 0.5833 0.6389
Observation 0.86 0.89 0.91 0.95 .01 1.05
Pi 0.6944 0.75 0.8056 0.8611 0.9167 0.9722
Construct a Weibull probability plot.

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation:

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.  

so, converting firstly the mixed fractions to improper fractions and then "adding".