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Updated on: 18 Sep 2016, 02:55
Originally posted by Nanobotstv on 18 Sep 2016, 02:47.
Last edited by Bunuel on 18 Sep 2016, 02:55, edited 1 time in total.
Last edited by Bunuel on 18 Sep 2016, 02:55, edited 1 time in total.
Renamed the topic and edited the question.
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (01:41) correct
19%
(01:59)
wrong
based on 209
sessions
History
Date
Time
Result
Not Attempted Yet
The average (arithmetic mean) of 16 students first quiz scores in a difficult English class is 62.5. When one student dropped the class, the average of the remaining scores increased to 64.0. What is the quiz score of the student who dropped the class?
a) 10
b) 25
c) 40
d) 55
e) 70
a) 10
b) 25
c) 40
d) 55
e) 70
28 Jan 2018, 14:25
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Hi All,
This question is a 'weighted average' question that gives you all of the numbers to work with, so solving it with arithmetic (the way that Mitch did) is a pretty standard approach for this type of prompt. There's a built-in concept that you can take advantage of to save some time though.
The one score that was removed from the total was small enough that it raised the average of the remaining 15 scores from a 62.5 to a 64. That 1.5 point increase per person, in total, would be (1.5)(15) = 22.5 points.
So the removed score had to be 22.5 points lower than the original average: 62.5 - 22.5 = 40.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
This question is a 'weighted average' question that gives you all of the numbers to work with, so solving it with arithmetic (the way that Mitch did) is a pretty standard approach for this type of prompt. There's a built-in concept that you can take advantage of to save some time though.
The one score that was removed from the total was small enough that it raised the average of the remaining 15 scores from a 62.5 to a 64. That 1.5 point increase per person, in total, would be (1.5)(15) = 22.5 points.
So the removed score had to be 22.5 points lower than the original average: 62.5 - 22.5 = 40.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
General Discussion
18 Sep 2016, 03:07
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alanforde800Maximus
Total Score of 16 students is 16*62.50 = 1000
Total Score of 15 students is 15*64 = 960
So, the score of the person who left is 40 ( 1000 - 960 )
Answer will be (C)
