In statistics, a process that consists of prolonging a

statistical series by introducing a new term that obeys the rule of the series to the sequence of given terms.

### Example

We represented the sequence of statistical data in the table below:

x |
2 |
3 |
5 |
7 |
9 |

y |
1 |
3 |
7 |
11 |
15 |

We determine that the relation that best describes this sequence is “y = 2*x* − 3.”

By extrapolation, we can determine that, if *x* = 30, then *y* = 57.