hw2 - September 29, 2007 [TAKE HOME QUIZ] Last Name_ First...

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September 29, 2007 [ TAKE HOME QUIZ ] 1 Last Name_____________ First Name_____________ Math 1070 Take Home Quiz Note: 1. The quiz is consisted of 20 multiple choices, with ONE choice only. 1 point would be counted for each problem. 2. Your grade for midterm I would be modified correspondingly according to your performance on this take home quiz. 3. The deadline for the quiz is: Oct. 6 th . 4. The quiz on Oct 1 st as shown on my syllabus is postponed for a week, namely, you will be expecting the Oct. 1 st quiz on Oct. 8 th . So, focus on this take-home quiz first!!
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September 29, 2007 [ TAKE HOME QUIZ ] 2 1 . A normal density curve has which of the following properties? a. It is symmetric. b. It has a peak centered above its mean. c. The spread of the curve is proportional to the standard deviation. d. All of the above. 2 . Scores on a University exam are normally distributed with a mean of 68 and a standard deviation of 9. Using the 68-95-99.7 rule, what percentage of students score above 77? a. 2.5% b. 5% c. 16% d. 32% 3 . The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the 68-95-99.7 rule, if students are given 90 minutes to complete the exam, what percentage of students will not finish? a. 32% b. 5% c. 2.5% d. 0.0015% 4 . Using the standard normal distribution tables, what is the area under the standard normal curve corresponding to Z < 1.15? a. 0.1357
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hw2 - September 29, 2007 [TAKE HOME QUIZ] Last Name_ First...

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