# What is the mean of the numbers 21, 23, 76, 47, 55, 135, 45, 30, 17?

Jul 7, 2016

$50$ (2sf)

#### Explanation:

When calculating the mean simply add all of the values together then divide by the number of values a general formula could be:

$\overline{x} = \frac{\sum x}{n}$

Where $x$ is the values in the list and $n$ is the number of values.

$\overline{x} = \frac{21 + 23 + 76 + 47 + 55 + 135 + 45 + 30 + 17}{9}$
$\overline{x} = 50$(2sf)