math
posted by My worst subject is math .
I am a little confused on the first question of this problem could someone please check my answers and please explain why and what I need to do to get correct answer thank you
Calculate the mean, and write this as a mixed fraction.
12,9,4,6,8,12,13,14,11,5,12,2,9,13
answer I got was:132 after addition step, then second step is to divide by 15 which I got was 8.8 now I guess my confusion is do I simplify it as 88/100 = 22/25 or do I take 100 divide it by 88 which is 1 12/88? which is the correct answer
is the mean or median a more useful representative of the set?
what is (median  mean)?
I don't know this one because I am confused about question a

First  I added the 14 numbers and they totaled 130.
If you forgot to include a 2 in your post, your answer would be right  the mean is 8.8.
The mixed fraction would be 8 8/10 = 8 4/5.
This site should help you understand this term.
http://www.mathsisfun.com/mixedfractions.html
The mean is the average of a set of numbers. The average of 4, 8, 9 is 7.
The median is the middle number of a set of numbers. The mean of 4, 8, 9 is 8. 
You have only 14 entries. Assuming you just didn't type one of the numbers in, 8.8 is correct. I would write that as a mixed fraction as 88/10 where  stands for a space (not a minus sign) and read as 8 and 8/10.

Yes I am sorry there was a typo there is supposed to be a 2...
also how would i subtract the median and the mean?
Thank you Ms Sue 
I didn't check your math. As a mixed fraction..
132/15=8 4/5
Median: rank the data in order. Find the center data point (median), half is greater, half is less.
What do you think is more useful?
(medianmean) is a measure of the tighness of the data, that is, are their wild extreme points?
Take the data 1,2,3,4, 100000000
the median is 3, the mean is a very big number. Which is more useful? What does medianmean mean here? 
Why do you need to subtract the median and the mean?
What is the mean of your 15 numbers? 
By the way I wrote it as 8 8/10 and didn't reduce it to the smallest numbers (as Ms. Sue did) because the problem didn't say in its simplest form. So I read 8.8 as 8 8/10. (But one of my teachers told me MANY years ago) that Bob, you ALWAYS reduce a fraction to its smallest term EVEN though I didn't tell you to do it.)

the mean of the 15 numbers is 132 divided by 15 = 8.8 which is 8 8/10 and the last part of the question which is question e) what is (median  mean=)
since my teacher didn't say to reduce it to simplest form should I do it anyways?? 
I'd follow DrBob's advice and reduce the fraction.
You know the mean of these 15 numbers. Now write them in numerical order. The median is the middle number. 
ok so I am going to reduce it
8 and 4/5  9 equals 1/5? 
median I got was 9

I didn't figure the median  but assuming it's 9, you should state the problem this way:
9  8 4/5 = 1/5 
Express the fractions 1/2, 3/16, and 7/8 with an LCD.
A. 8/16, 3/16, 14/16
B. 4/8, 6/8, 14/8
C. 1/32, 3/32, 7/32
D. 1/4, 3/4, 7/4