Exam 1a Fa 07 sec 10 KEY

# Exam 1a Fa 07 sec 10 KEY - ECON 2843 Exam 1 Fall 2007 Form...

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ECON 2843 Name KEY Exam 1 ID # Fall 2007 Lab instructor Form A Meeting Time Students must show all work on problems that involve calculation. Questions 1 through 4 refer to the following. The manager of the help-line at a local software manufacturing firm collected data on the number of calls the help desk received per shift for the last 100 days. The data is summarized in the table below. Number of Calls Number of Days 80 – under 120 1 120 – under 160 21 160– under 200 29 200 – under 240 32 240 – under 280 15 280 – under 320 2 1. What is the standard deviation of this sample? (8 points) 5 a. 42.8486 b. 43.0644 * c. 1836 d. 1854.55 e. 3080 2. Calculate the coefficient of variation. (6 points) 21.75% 3. What is the probability that the number of calls on a randomly selected day will be less than or equal to the number of calls in the median class? (6 points) .51 4. What is the cumulative frequency of the class 240 – under 280? (6 points) 98 1

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Questions 5 – 8 refer to the following. “Just when you thought the mommy wars were over, a new study shows the divide has grown
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Exam 1a Fa 07 sec 10 KEY - ECON 2843 Exam 1 Fall 2007 Form...

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