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Exam 1a Spring 05 KEY

# Exam 1a Spring 05 KEY - ECON 2843 010 Exam 1 Spring 2005...

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Name Exam 1 ID # Spring 2005 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation. Questions 1 through 5 refer to the following. In anticipation of the adoption of a wireless service, the University of Oklahoma had the length of local telephone calls by faculty and staff measured in January of 2005. The relative frequency distribution of lengths of calls in minutes was recorded for the population. Length of relative Call in minutes frequency 1 up to 4 .35 4 up to 7 .30 7 up to 10 .20 10 up to 13 .10 13 up to 16 .05 1. Calculate the mean length of call for this population. 5 a. 5.33 b. 6.10 * c. 8.50 d. 9.75 e. 15.0 2. What is the median age class? a. 1 up to 4 b. 4 up to 7 * c. 7 up to 10 d. 10 up to 13 e. 13 up to 16 3. What is the standard deviation? 3.4986 4. Calculate the cumulative relative frequency of the class 10 - 13. a.

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Exam 1a Spring 05 KEY - ECON 2843 010 Exam 1 Spring 2005...

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