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13 Jan 2017, 05:08
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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From a group of 8 volunteers, including karen and Andrew, 4 people are to be selected at random to organize a charity event. What is the probability that Andrew will be among the 4 volunteers selected and Karen will not?
A) 3/7
B) 5/12
C) 27/70
D)2/7
E)9/35
I am sorry if this question has been covered in another post, but here is my take on the problem posted above.
Andrew has a 50% percent chance of being chosen, as there are a total of 8 volunteers and 4 will be chosen at random.
Then, we can view the second part of the question as an complimentary question (or something not happening)
Therefore the probability of Karen being chosen is 3/7. Then... 1-3/7 (the complimentary) is 4/7.
We can the take 1/2 x 4/7 to be 4/14.
4/14 simplified is 2/7
Answer D
Could somebody please clarify whether this is an acceptable method for the question, or whether I achieved the corrected answer simply out of luck.
The OA is D
A) 3/7
B) 5/12
C) 27/70
D)2/7
E)9/35
I am sorry if this question has been covered in another post, but here is my take on the problem posted above.
Andrew has a 50% percent chance of being chosen, as there are a total of 8 volunteers and 4 will be chosen at random.
Then, we can view the second part of the question as an complimentary question (or something not happening)
Therefore the probability of Karen being chosen is 3/7. Then... 1-3/7 (the complimentary) is 4/7.
We can the take 1/2 x 4/7 to be 4/14.
4/14 simplified is 2/7
Answer D
Could somebody please clarify whether this is an acceptable method for the question, or whether I achieved the corrected answer simply out of luck.
The OA is D
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
13 Jan 2017, 05:41
Kudos
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Hi, this is how I would solve it.
Total # selections possible: 8C4 = 70
Andrew has his spot fix so we need to select for remaining 3 spots
Since Karen should not be in the team, we have 6 people to select from for 3 spots= 6C3 = 20
20/70= 2/7
Ans: D
Sent from my iPhone using Tapatalk
Total # selections possible: 8C4 = 70
Andrew has his spot fix so we need to select for remaining 3 spots
Since Karen should not be in the team, we have 6 people to select from for 3 spots= 6C3 = 20
20/70= 2/7
Ans: D
Sent from my iPhone using Tapatalk
13 Jan 2017, 06:59
Kudos
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Kesterton2017
From a group of 8 volunteers, including karen and Andrew, 4 people are to be selected at random to organize a charity event. What is the probability that Andrew will be among the 4 volunteers selected and Karen will not?
A) 3/7
B) 5/12
C) 27/70
D)2/7
E)9/35
I am sorry if this question has been covered in another post, but here is my take on the problem posted above.
Andrew has a 50% percent chance of being chosen, as there are a total of 8 volunteers and 4 will be chosen at random.
Then, we can view the second part of the question as an complimentary question (or something not happening)
Therefore the probability of Karen being chosen is 3/7. Then... 1-3/7 (the complimentary) is 4/7.
We can the take 1/2 x 4/7 to be 4/14.
4/14 simplified is 2/7
Answer D
Could somebody please clarify whether this is an acceptable method for the question, or whether I achieved the corrected answer simply out of luck.
The OA is D
A) 3/7
B) 5/12
C) 27/70
D)2/7
E)9/35
I am sorry if this question has been covered in another post, but here is my take on the problem posted above.
Andrew has a 50% percent chance of being chosen, as there are a total of 8 volunteers and 4 will be chosen at random.
Then, we can view the second part of the question as an complimentary question (or something not happening)
Therefore the probability of Karen being chosen is 3/7. Then... 1-3/7 (the complimentary) is 4/7.
We can the take 1/2 x 4/7 to be 4/14.
4/14 simplified is 2/7
Answer D
Could somebody please clarify whether this is an acceptable method for the question, or whether I achieved the corrected answer simply out of luck.
The OA is D
This question is discussed here: from-a-group-of-8-volunteers-including-andrew-and-karen-160883.html Please post there in case of any further questions.
Also, please follow the rules when posting a question: rules-for-posting-please-read-this-before-posting-133935.html Thank you.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
