Acompany interested in lumbering rights for a certain tract of slash pine trees is told that the mean diameter of these trees is 19 inches with a standard deviation of 2.3 inches. assume the distribution of diameters is roughly mound-shaped. (a) what fraction of the trees will have diameters between 14.4 and 25.9 inches? 0.75 incorrect: your answer is incorrect. (b) what fraction of the trees will have diameters greater than 21.3 inches?