As covered in the previous mountain entry , the Mean/Average is a measure of central tendency that gives you a sense of the "typical" value in the data.

How Do We Calculate It (The Formula)

$$\frac{sum \ of \ all \ data}{\# \ of \ numbers}$$

Example

What is the mean, or average, of the seven numbers below?

$$6, 5, 13, 8, 20, 14, 11$$

Step 1: Calculate the sum of the seven numbers.

$$6+5+13+8+20+14+11 = 77$$

Step 2: Divide the sum from step 1 by the number of numbers.

$$\frac{77}{7}$$

$$=11$$