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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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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