Math10Exam2Winter2011

Math10Exam2Winter2011 - Math 10 Winter 2011 FORM W Exam 2:...

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Math 10 Winter 2011 FORM W Name Last:______________ First: ___________________ Exam 2: Chapters 4,5,6,7 Class Time:________________________ DIRECTIONS: Print your NAME and CLASS TIME on THIS EXAM. Print your NAME and CLASS TIME on your SCANTRON. • Write FORM A on your SCANTRON. • Each question has exactly one BEST answer. There are 21 questions. • You may write on this exam. There is no scratch paper allowed. • Each question is worth 5 points for a total of 105 points. This includes 5 bonus points! • If you have no note page, you must write NO NOTES on your SCANTRON. • Put your SCANTRON and PAGE of NOTES inside your EXAM. Before you start packing up your things, turn in your EXAM and SCANTRON. Then go back to your desk to pack up your materials. When your exam is returned, you will get back all materials you turned in. • Turn your cell phone OFF. Any noise from a cell phone will signal that your exam is over. • FAILURE TO FOLLOW ALL INSTRUCTIONS WILL COST YOU THE 5 BONUS POINTS! 1. The graph below shows three normal probability distributions. Which distribution has the largest value of µ ? Which distribution has the largest value of σ ? A. Largest µ : Graph I ; Largest σ : Graph II B. Largest µ : Graph III ; Largest σ : Graph II C. Largest µ : Graph II ; Largest σ : Graph III D. Largest µ : Graph III ; Largest σ : Graph I 2. The following represents the probability distribution for the number of Advanced Placement (AP) exams taken by students at City High School. Let X = the number of AP exams taken by one student enrolled at City High School. X P(X) 0 0 . 68 1 0 . 09 2 0 . 12 3 4 0 . 05 Find the expected value for the average number of AP exams taken by students enrolled at this high school. A. 0 B. 2.0 C. 0 . 71 D. 0 . 53
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3. At a certain location the carbon monoxide levels (in mg/m 3 ) in the atmosphere follow an unknown distribution with an average of 7 . 4 and a standard deviation of 2.4. Find the probability that for a random sample of 30 test measurements, the sample average carbon monoxide level is less than 7 . 2. A. 0 . 3240 B. 0 . 6760 C. 0 . 4658 D. Not possible to determine 4. According to data from the USGS, on average 18 large earthquakes occur each year worldwide. (United States Geological Survey (USGS): Earthquakes magnitude 7 or higher: http://earthquake.usgs.gov/learn/topics/increase_in_earthquakes.php) Find the probability that at most 15 large earthquakes occur during a one year period. A. 0 . 0786 B. 0 . 7919 C 0 . 2867 D. 0 . 7919 Questions 5 - 7 refer to the following: Suppose that the amount of time that it takes a worker to complete an online training module is uniformly distributed between 40 and 56 minutes. 5. Find the probability that it takes one worker less than 45 minutes to complete this training module. A. 0 . 3125 B. 0 . 8036 C. 0 . 1024 D. 0 . 2581 6. Find the 60 th percentile of completion times (in minutes) for the training module. A. 33 . 6 B. 49 . 6 C. 46 . 4 D. 52 . 6 7. What is the appropriate probability distribution for the sample mean time to complete the module for samples of 40 workers?
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This note was uploaded on 11/27/2011 for the course MATH 10 taught by Professor Plum during the Fall '11 term at DeAnza College.

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Math10Exam2Winter2011 - Math 10 Winter 2011 FORM W Exam 2:...

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