Mean, Median, & Mode

Mean:

  -Is the number commonly used to characterize a set of data.  It is also frequently called the average.  To find the mean of a number you add up all of the numbers and divide by how many numbers there are.

Example: 2,3,3,4,6,7,7,8,9
-add 2+3+3+4+6+7+7+8+9=49
   -49 divided by 9; equals 5.4
*5.4 is the mean!!

Median:

  -Is the value exactly in the middle of an ordered set.

1. Arrange the numbers in order from least to greatest.
2. a. If n is odd, it is the middle number

          b. If n is even, it is the mean of the 2 middle numbers.

Example: 2,3,3,4,6,7,7,8,9
  -6 is the median because it is directly in the middle

Mode:

   -The set of data that has the most frequency.  It has nothing to do with the central tendency.

Example: 2,3,3,4,6,7,7,8,9
   -both 3 & 7 are the mode becasue they both occur twice

Mean, Median, Mode website!
http://www.regentsprep.org/Regents/math/ALGEBRA/AD2/measure.htm