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?

97.5 %

15.7 %

Step-by-step explanation:

= Mean = 19

= Standard deviation = 2.3

a)

From the empirical rule we get that the percentage of trees between 14.4 and 25.9 inches is 13.6+34.1+34.1+13.6+2.1 = 97.5 %

b)

The fraction of tree under 21.3 inches is 34.1.

Hence the fraction of trees above the diameter of 21.3 inches is 13.6+2.1 = 15.7 %

i am sorry it just submitted an answer but the answer is 365 boys. hopes this

step-by-step explanation:

the answer to the expression is 83