Maths.

Satistics

Mean, median, and mode are three kinds of "averages". There are many "averages" in statistics, but these are, I think, the three most common, and are certainly the three you are most likely to encounter in your pre-statistics courses, if the topic comes up at all.

Place Values and Objects > Numbers, such as 84, have two digits. Each digit is a different place value. > The left digit is the tens' place. It tells you that there are 8 tens. > The last or right digit is the ones' place which is 4 in this example. Therefore, there are 8 sets of 10, plus 4 ones in the number 84.

> 8 4

> | |__ones' place

> |_________tens' place


 * The number 24 could be represented by this table:**


 * 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 10 ||
 * 11 || 12 || 13 || 14 || 15 || 16 || 17 || 18 || 19 || 20 ||
 * 21 || 22 || 23 || 24 ||  ||   ||   ||   ||   ||   ||


 * The tens' place value of 2 in the number 24 is due to the presence of two full sets of 10.**
 * The ones' place value of 4 in the number 24 is due to 4 units that are not included in a full set of 10.**

Rounding and Compensating

So we plus 2 to a number and -2 to make a driftnet equation **like 38, 22 so it would be 40 and 20 40 and 20 = 60.**