Question

In the notation \[ \sum\limits_{i=1}^{N} x_i \], what does \[ \Sigma \] mean?

Options

• Multiply all the terms together

• “Add up”: the sum of all the terms that follow

• Stop adding at the first score

• Find the middle score

Answer 1

The symbol \[ \Sigma \] (sigma) means 'Add up'. It indicates the sum of all the terms that follow.