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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 takehome quiz first!!
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View Full DocumentSeptember 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 689599.7 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 689599.7 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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 Summer '08
 AKBAS
 Math, Statistics

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