The common fruit fly drosophila melanogaster is the most studied organism in genetic research because it is small, is easy to grow, and reproduces rapidly. the length of the thorax (where the wings and legs attach) in a population of male fruit flies is approximately normal with mean 0.800 millimeters (mm) and standard deviation 0.077 mm. (round your answers to four decimal places.) (a) what proportion of flies have thorax lengths less than 0.7 mm?