6. It is known that the diameter of Douglas fir trees is normally distributed with = 50cm and o = 12cm. (a) What is the probability that a randomly selected Douglas fir tree has a diameter greater than 73cm? € (b) What proportion of Douglas fir trees have diameter between 40 and 55cm? (c) Find the diameter, d, such that 30% of Douglas fir trees have diameters that exceed d.

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