Question

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

Options

• Subtract the first score

• Add only one score

• Start adding from the first score

• Stop at the last score

Answer 1

The \[ i=1 \] below \[ \Sigma \] tells you to start adding from the first score. Therefore the sum begins with \[ x_1 \].