Vavish,

I believe that the text is not correctly transcript.

Although, according to was is written the answer is C.

Lets see how.....

From 1,2,3,.....,10 you have to chose a serie of five that gives the greater possible mean but the least median and that can only be...

{1,2,3,9,10}, why? because it minimize the median (=3) and chosing the numbers 9 and 10 we can only maximize the mean (=5).

So 5-3=2

Hope it helps

no i still dont understand...can you explain...[/quote]

We know to find the median you have to reorder the numbers from least to greatest and pick the middle number - {1,2,3,9,10}

What about 9 and 10? because you're asked to find the mean (average) bigger than the median (in this case, bigger than 3).

Mean = 1+2+3+9+10/5 = 5.

If you find the difference between both average and median

5-3=2.

Thanks for help me with my reasoning, Carol.