Practice Midterm 1 Lin

# Practice Midterm 1 Lin - MATH 218 | Fall 2008 Joy's...

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MATH 218 | Fall 2008 Joy’s Practice Midterm #1 SI Leader: Joy Chen Professor Lin If you have questions or want to check answers, drop by anytime during my office hours this week: [Thursday, Sept 25 th from 330-5pm in JKP 102] This midterm was designed to be longer than your real one. In order to simulate the environment of your real exam, allow yourself approximately 8 minutes per question, for a total of 56 minutes. You should be able to complete this exam within 60-65 minutes.

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2. 1. The US Department of Labor Statistics compiles data on the work force. The following contingency table is organized by location and sex (in thousands). The probability of a female and working in a place other than office or home is 0.386. Complete the table. Office Home Other Total Male 54 Female 97 567 Total 223 577 951 a. Find the probability that a person of the work force works either at home or another place but not in the office. b. What is the probability that a random selected person is a male working in a place other than the office? c. What is the probability that a randomly selected person works in an office given that he was a male? d. What is the probability that Mary doesn’t work at home? e. Are the events “working in an office or at home” and “female” independent of each other? Justify your answer. f. Are workplace and gender independent of each other? Justify your answer.
3. 2. Nintendo is looking to review their records of Wii users. Last year in the U.S., 75% of Wii users were students between the ages of 15 and 25. Out of the owners of Wii in the target age group, 20% owned one other game console (such as the Microsoft Xbox 360 or

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## Practice Midterm 1 Lin - MATH 218 | Fall 2008 Joy's...

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