The following students are enrolled in a course in Introductory Sociology. They are listed along with their year in school and whether they are majoring in sociology
Sociology
Student Year Major
1 Sophomore Yes
2 Senior No
3 Junior Yes
4 Freshman No
5 Freshman Yes
6 Sophomore Yes
7 Sophomore Yes
8 Junior No
9 Sophomore Yes
10 Sophomore No
What is the probability of selecting at random from this class
a. a sophomore?
b. a student majoring in sociology?
c. a freshman or a sophomore?
d. not a freshman?
What would be an ideal response?
a.
= = =
number of sophomores 5
.50
total number of students 10
P
b.
number of sociology majors 6
.60
total number of students 10
P = = =
c.
= = =
number of freshmen and sophomores 7
.70
total number of students 10
P
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