Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2601:30 AM EDT
-02:30 AM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
May 0111:00 AM PDT
-12:00 PM PDT
Free- full-length test + 15 concept videos + 150+ short videos + study plan!
09 Nov 2021, 04:00
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
30% (03:15) correct
70%
(03:12)
wrong
based on 79
sessions
History
Date
Time
Result
Not Attempted Yet
Brian is analyzing the performance of certain stocks. He finds that for the first fifteen days of a 30 day period, the daily closing price per share of Phonexpharma Inc. conformed to the function \(f(x)=0.4x+2\) , where x represents the day in the period. He found that for the last 15 days in the same period, the stock followed the function \(f(x)=(-\frac{1}{7})x+9\), where x represents the day in the period. Approximately what is the median closing price per share of Phonexpharma Inc. for the entire 30 day period?
A. 4.7
B. 5.55
C. 6.71
D. 8
E. 11.1
A. 4.7
B. 5.55
C. 6.71
D. 8
E. 11.1
09 Nov 2021, 21:54
Kudos
Bookmarks
Bunuel
The value of stock in first 15 days will be 2.4,2.8,3.2.......7.6,7.8 (common difference 0.4)
The value of stock in last 15 days will be 47/7, 46/7,45/7.......34/7,33/7 or say 6.71, 6.57,6.43,.....4.85,4.71(common diff 1/7 or approx 0.14)
We have to find the average of 15th and 16th term when all the above values are arranged in ascending or descending order
From the options, we can easily discard D and E. And C can also be discarded as they are the extreme terms of the 2nd AP.
Option B
05 Nov 2025, 00:27
Kudos
Bookmarks
Bunuel
The first 15 days of the 30 day period confirms the function : \(f(x)=0.4x+2\) , where x represents the day in the period.
so, x assumes the values from 1,2,3,4.... Till 15.
Let’s assume this to be CASE 1:
And, the values of
f(x) = 2.4 , when x=1
f(x) = 2.8, when x=2
f(x) = 3.2 , when x=3
then 3.6, 4.0, 4.4, 5.2, 5.6 , 6.0, 6.4, 6.8, 7.2, 7.6, 8.0
In 2.xx range, number of values = 2
In 3.xx range, number of values = 2
In 4.xx range, number of values = 2
In 5.xx range, number of values = 2
In 6.xx range, number of values = 3
In 7.xx range, number of values = 2
In 8.xx range, number of values = 1
Case 2:
The last 15 days of the stock followed the pattern of : \(f(x)=(-\frac{1}{7})x+9\), where x represents the day in the period.
Numbers which are multiples of 7 after 15 are: 21 and 28.
with x = 21, f(x) = 6
with x = 28, f(x) = 5.
so the values of x=29 and x=30, should be below 5.0 mark, thus ONLY 2 VALUES falling in the 4.xx range.
The number of values in the band less than 6.0 but greater than 5.0 , that’s within the 5.xx band is (28-22)+1 = 7 values.
And we can also infer that the values for, x =16 till x =20 lies within the 6.xx band. There are 5 such values in 6.xx range.
In the 6.xx range, the number of values = 5
In 5.xx range, the number of values = 7
In the 4.xx range , the number of values = 2
Median = (15th value +16th value)/2
There are 8 values in the 2.xx and 5.xx range in case 1.
including the 4.xx range from case 2, we get 2 more values, totalling to 10 values.
5.xx range values from case 2, which lies in the median slot of 15th and 16th value.
Thus by approximation, we can arrive at the median value to be 5.xx
Option B
5.55
