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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.
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.
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.
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
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