# Accuracy in measurement

**Continuous and accuracy in measurements**

The continuous nature of measurement means that they cant always be exact and therefore an element of rounding is required.

For example, if the length of a pen is given as 15 cm to the nearest cm, then the length can be anything between 14.5 cm and 15.5 cm.

This can be written as 14.5 cm ≤ pen < 15.5 cm (to 1 d.p.)

Point to note:

- 14.5 cm – this is the lower bound
- 15.5 cm – is this the upper bound