6.20 The diameters of Douglas firs grown at a Christmas tree farm are normally distributed with a mean of 4 inches and a standard deviation of 1.5 inches.
a) what proportion of the trees will have diameters between 3 and 5 inches?
b) what proportion of trees will have diameters less than 3 inches?
c) Y...
Friday, October 10, 2014
proportion
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