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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1053
GPA: 3.39
In the graduating class of a certain college, 48 percent of the studen
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10 Jan 2023, 01:21
10 Jan 2023, 01:21
1
Expert Reply
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Question Stats:
83% (02:20) correct
16% (02:39) wrong based on 6 sessions
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In the graduating class of a certain college, 48 percent of the students are male and 52 percent are female. In this class 40 percent of the male and 20 percent of the female students are 25 years old or older. If one student in the class is randomly selected, approximately what is the probability that he or she will be less than 25 years old?
A. 0.9
B. 0.7
C. 0.45
D. 0.3
E. 0.25
A. 0.9
B. 0.7
C. 0.45
D. 0.3
E. 0.25
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1053
GPA: 3.39
Re: In the graduating class of a certain college, 48 percent of the studen
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12 Jan 2023, 21:52
12 Jan 2023, 21:52
2
Expert Reply
Percent of students who are 25 years old or older is 0.4*48+0.2*52=~30, so percent of people who are less than 25 years old is 100-30=70.
Answer: B.
This can also be done with an approximation method. Since the percent of men and women are almost the same (48% and 52%) then the percent of students who are 25 years old or older will be close to the average of 40% and 20%, so close to 30%, which makes percent of people who are less than 25 years old close to 70%.
Answer: B.
Answer: B.
This can also be done with an approximation method. Since the percent of men and women are almost the same (48% and 52%) then the percent of students who are 25 years old or older will be close to the average of 40% and 20%, so close to 30%, which makes percent of people who are less than 25 years old close to 70%.
Answer: B.
gmatclubot
Re: In the graduating class of a certain college, 48 percent of the studen [#permalink]
12 Jan 2023, 21:52
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