Table:
Score Interval----- Number of scores
50-59 ------------- 2
60-69 ------------- 10
70-79 ------------- 16
80-89 ------------- 27
90-99 ------------- 18
The table above shows the distribution of test scores for a group of management trainees. Which score interval contains the median of the 73 scores?
A. 60-69
B. 70-79
C. 80-89
D. 90-99
E. It cannot be determined from the information given.
How do I solve this?
Thanks!
GMATPrep question..How do I solve this?
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The correct answer is CSharonRaj wrote:Table:
Score Interval----- Number of scores
50-59 ------------- 2
60-69 ------------- 10
70-79 ------------- 16
80-89 ------------- 27
90-99 ------------- 18
The table above shows the distribution of test scores for a group of management trainees. Which score interval contains the median of the 73 scores?
A. 60-69
B. 70-79
C. 80-89
D. 90-99
E. It cannot be determined from the information given.
How do I solve this?
Thanks!
This is by no means the "proper" algebraic approach, but here's what I do in these types of questions:
1. I give the different ranges a variable. Lets say:
50-59 = A
60-69 = B
70-79 = C
80-89 = D
90-99 = E
2. Now we know there are 2 A's 10 B's 16 C's 27 D's and 18 E's, and we know the median is the middle variable in the set.
3. So, list them all out like this:
AABBBBBBBBBBCCCC..... EEEEE. It's a little tedious, but I like the visualization.
4. Then cancel out one value at a time from both sides.
5. Finally you will find a middle variable, here it is D. What is D? D=80-89. So the correct answer is C.
Let me know if this helps
A useful website I found that has every quant OG video explanation:
https://www.beatthegmat.com/useful-websi ... tml#475231
https://www.beatthegmat.com/useful-websi ... tml#475231
Hi,
My approach is to find the median from 73 sample scores.
So, the median is (73+1)/2 = 37.
Then, you add the number of score from the lowest tier. From tier 50-59 to 70-79, you will get 28 scores (2+10+16).
Now you know that the median at 37 is contained in the tier 80-89 since 28+27 = 55 scores which already higher than 37.
Answer is C.
My approach is to find the median from 73 sample scores.
So, the median is (73+1)/2 = 37.
Then, you add the number of score from the lowest tier. From tier 50-59 to 70-79, you will get 28 scores (2+10+16).
Now you know that the median at 37 is contained in the tier 80-89 since 28+27 = 55 scores which already higher than 37.
Answer is C.
Last edited by trojanas on Mon Aug 27, 2012 6:48 am, edited 1 time in total.
Trojanas: Thanks to you too. You mentioned the median is 37 and it is in tier 70-79 but the answer is C (80-89). At first, I was a bit confused but I guessed it was a typing error:)
trojanas wrote:Hi,
My approach is to find the median from 73 sample scores.
So, the median is (73+1)/2 = 37.
Then, you add the number of score from the lowest tier. From tier 50-59 to 70-79, you will get 28 scores (2+10+16).
Now you know that the median at 37 is contained in the tier 70-79 since 28+27 = 55 scores which already higher than 37.
Answer is C.
Thanks, SharonRaj!! You are right, I already corrected it.
SharonRaj wrote:Trojanas: Thanks to you too. You mentioned the median is 37 and it is in tier 70-79 but the answer is C (80-89). At first, I was a bit confused but I guessed it was a typing error:)
trojanas wrote:Hi,
My approach is to find the median from 73 sample scores.
So, the median is (73+1)/2 = 37.
Then, you add the number of score from the lowest tier. From tier 50-59 to 70-79, you will get 28 scores (2+10+16).
Now you know that the median at 37 is contained in the tier 70-79 since 28+27 = 55 scores which already higher than 37.
Answer is C.
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Since there are 73 scores, the median score will be at the (73+1)/2 = 74/2 = 37th position.SharonRaj wrote:Table:
Score Interval----- Number of scores
50-59 ------------- 2
60-69 ------------- 10
70-79 ------------- 16
80-89 ------------- 27
90-99 ------------- 18
The table above shows the distribution of test scores for a group of management trainees. Which score interval contains the median of the 73 scores?
A. 60-69
B. 70-79
C. 80-89
D. 90-99
E. It cannot be determined from the information given.
Therefore, we need to find the interval that contains the score at the 37th position. From the table, we know that the interval 50-59 contains scores of the 1st and 2nd positions, the interval 60-69 contains scores of the 3rd to 12th positions, the interval 70-79 contains scores of the 13th to 28th positions, and the interval 80-89 contains scores of the 29th to 55th positions.
Thus, the interval 80-89 must contain the median score, i.e., the score at the 37th position.
Answer:C
Jeffrey Miller
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