Exam 2a 010 Fa 04 key

# Exam 2a 010 Fa 04 key - ECON 2843 010 Exam 2 Fall 2004 Form...

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ECON 2843 – 010 Name KEY Exam 2 ID # Fall 2004 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation, even if the answer is multiple choice. 1. Loggers cut down soft pine trees at the end of their 10-year growth cycle. They find that trunk diameters for these trees are normally distributed with a mean of 35 inches and standard deviation of 2.2 inches. What is the probability that a randomly selected tree will have a trunk diameter greater than 39 inches? a. .0207 b. .0344 * c. .39 d. .9656 e. .9793 2. Refer to question 1. A tree is classified "typical" if its trunk diameter is in the middle 70% of the distribution of all diameters. Between what two values for the trunk diameter do the middle 70% of trees fall? Between 32.71 and 37.29 1

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Questions 3 - 5 refer to the following: A citizen's group is exploring the savings per family of a recent state tax cut, which is assumed to be normally distributed with a standard deviation of \$240.
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## This note was uploaded on 04/07/2008 for the course ECON 2843 taught by Professor Hudgins during the Spring '08 term at The University of Oklahoma.

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Exam 2a 010 Fa 04 key - ECON 2843 010 Exam 2 Fall 2004 Form...

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