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The heights of pecan trees are normally distributed

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The heights of pecan trees are normally distributed with a
mean of 10 feet and a standard deviation of 2 feet. Show all work.
-(a) What is the probability that a randomly selected pecan tree is between 8.5 and 12.5 feet tall? (round the answer to 4 decimal places)
-(b) Find the 90th percentile of the pecan tree height distribution. (round the answer to 2 decimal places)

(c) To get the answers for part (a) and part (b), what technology did you use? If an online applet was used, list the URL and describe the steps. If a calculator or Excel was used, write out the function

 
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