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
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
It appears that you are browsing the GMAT Club forum unregistered!
Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club
Registration gives you:
Tests
Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.
Applicant Stats
View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more
Books/Downloads
Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
More than half score more than 85, so median is more than 85.
If the remain ones score are all 84, we may got the mean to be 84.52.
[(85*13)+(84*12)]/25=84.52<85
I think it is E.
Statement I - Insufficient
Explanation: Several possibilities here. Imagine all numbers to be 71. So, median would be 71 and mean would be 70.xx. In this case, mean < median. However, imagine 13 students got 71 and rest (12) students got 99. Then, median is still 71. And mean is 75.xx. In this case mean > median.
Statement II - Insufficient
Explanation: Imagine 12 students got 71. And rest (13) got 86. Then, median is 86 and mean is 78.xx. So, mean < median in this case. Consider case (ii) under statement I above which proves mean > median.
Hope my answer is correct and that I didn't confuse you too much. If anyone doesn't agree with my explanation, please let me know.
"Consider case (ii) under statement I above which proves mean > median. "
In case (ii) under statement I, more than half the number of students did not score more than 85, (u have assumed 13 scored 71) so mean > median proves wrong.
Statement - I : NOT SUFFECIENT. We do not have mnuch information
Statement II: NOT SUFFECIENT
case-1, 12 students get 85, 13 students get 86. So median is 86, but the mean is surely less than 86, so mean < median, ANSWER NO
case-2: 12 students get 85, 1 student get 86, the remaining 12 students get 100. So median is still 86, but the mean has shifted above 86. So mean > median. ANSWER IS YES.
Mean is nothing but the average i.e., sum of all the numbers/number of numbers
Median is the middle number when arranged in acending or descending order. It is unique if the number of numbers arranged is odd. Otherwise(when the number of numbers are even and are arranged in ascending/descending order), the two middle numbers are averaged to get the median i.e., (a+b/2)
Mode is the most frequently recurring number/numbers among the given set of numbers. It can be more than one.
bono wrote:
Could somebody give definitions of "mean" and "median"? I met these terms before but they still confuse me
Re: One class has 25 students, they take a test, is the median [#permalink]
23 Nov 2015, 04:13
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________