0.1.2 - Summations

$$\Sigma$$

This is the Greek capital letter "sigma." In math, this symbol is also known as a summation. This tells us that we should add a series of numbers (i.e., take the sum).

Example: Candy Section

Four children are counting how many pieces of candy they each have. They want to know how many pieces of candy they have all together.

Child Pieces of Candy
Jenny 9
Carrie 8
Eugenia 10
Kevin 8

If we wanted to know how many total pieces of candy the group of children had, we could add these four numbers. The notation for this is $$\sum x_{i}$$.

$$\sum x_{i}=9+8+10+8=35$$

Combined, the four children have a total of 35 pieces of candy.