A university conducted a survey of 277 Sophomore, Junior, and Senior undergradua
ID: 3335325 • Letter: A
Question
A university conducted a survey of 277 Sophomore, Junior, and Senior undergraduate students regarding satisfaction with student government. Results of the survey are shown in the table by class rank.
Sophomore
Junior
Senior
Total
Satisfied
46
64
60
170
Neutral
16
18
12
46
Not satisfied
20
15
26
61
Total
82
97
98
277
A survey participant is selected at random. What is the probability that he or she is a
Junior
or
Senior?
The probability that a student is a
Junior
or a
Senior
is
?.
Sophomore
Junior
Senior
Total
Satisfied
46
64
60
170
Neutral
16
18
12
46
Not satisfied
20
15
26
61
Total
82
97
98
277
Explanation / Answer
P( student is junior or senior) is given by the sum of columns containing the value junior and senior. i.e (97+98)/277 = 0.704
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