Suppose the diameter at breast height (in.) of trees of a certain type is normally distributed...

Suppose the diameter at breast height (in.) of trees of a certain type is normally distributed with mean 8.8 inch and standard deviation 2.8 inch, as suggested in the article “Simulating a Harvester-Forwarder Softwood Thinning” (ForestProducts J., May 1997: 36–41).

f. What is the probability of exactly 2 out of 4 trees have diameter exceeding 10 in?

g. What is the probability of at least 3 out of 4 have diameter exceeding 10 in?

Note: the answer to a, b , c, and d are available in the solution manual.

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