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Exam 1a Fall 05 KEY

# Exam 1a Fall 05 KEY - ECON 2843 010 Exam 1 Fall 2005 Form A...

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ECON 2843 – 010 Name KEY Exam 1 ID # Fall 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. A sample of 40 OU freshmen was asked how many university campuses they visited during their senior year in high school. The table shows the cumulative frequency distribution. Number of cumulative Campus visits frequency 0 up to 4 8 5 up to 9 23 10 up to 14 33 15 up to 19 40 1. Calculate the mean number of campus visits in this sample. 5 a. 9 * b. 9.5 c. 12.048 d. 31.325 e. 90 2. What is the median age class? a. 0 up to 4 b. 5 up to 9 * c. 10 up to 14 d. 15 up to 19 3. What is the cumulative relative frequency of the class 10 up to 14? .825 4. Calculate the variance. a. .2564 b. 4.9749 c. 5.0383 d. 24.75 e. 25.3846 * 1

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5. If one these 40 students is randomly selected, what is the probability they that he/she will have visited less campuses than the modal class?
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Exam 1a Fall 05 KEY - ECON 2843 010 Exam 1 Fall 2005 Form A...

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