Mean, Mode, Median and Deviation

The Mean is the average of numbers or norm in a sequence. To find the mean you have to add up all the numbers to find the total, then divide by how many numbers you added up. For example: 2 + 4 + 3 + 2 + 1 + 2 + 3 = 17 / 7 = 2.42857142857 (rounded down is 2).

Mode is the most common number in a sequence, the easiest way to find it is put all the numbers in the sequence in lowest to highest and choose the number that is most common in the sequence. Example: 2 4 3 2 1 2 3

= 1 2 2 2 3 3 4 the most common here is 2.

Median is the middle number of the sequence. The easiest way to find it is put all the numbers in the sequence in lowest to highest and choose the number in the middle, if it is uneven then pick halfway between the two middle numbers. Example: 2 4 3 2 1 2 3 =

1 2 2 2 3 3 4 the middle number is 2.

Deviation is the difference between the observed value of a variable and another value of another variable.